The real problem with this system it's the method used which add too many things that need to be fine adjusted, most of the system use sine wave instead of square which reduce absorption of energy from 2x3/8 to 2x1/4. Also everything is simple cascading using mutual inductance, where maximum attention and adjustments are needed for coupling.
You need a great precision and accuracy in build to obtain, amplify and maintain the effects involved in absorption of energy from local environment and any little discrepancy in wire length will amplify losses instead of overcome them.
For example if the gain is in range of 5-10% from first circuit and further amplified in 2-3 circuits. Lets say in first circuit for any little mistake you lose efficiency than amplified what you can get ?
Also you need to know that at high frequency and high voltage or high current copper wire will lose at least 60% of its ohmic resistance which is a great factor for inductance and q factor.
When using a resonator which is your secondary it must amplify, that means you need a different ratio for of multiple fraction of wave length.
When mutual inductance is used for power transmission you need some certain capacitance as can be observed in tide windings you need to carefully adjust capacitance in order to maintain inductance and q factor at desired level otherwise you introduce a lot of losses in the system and great amount of work is carried out.
As a general rule when replicating is to copy the work if you don't understand how and why is working said device. Or if you can understand the phenomena and you can see in your mind device working following the input a along the system, find the relationship between each component and recalculate the whole system for each component you change and double check if is generating same effect in system.
Why is important to calculate Q factor ? Is the most important characteristic of the system. A high Q factor for a coil typically falls within the range of 50 to 1000 or even higher, depending on the specific application. This range indicates that the coil has low energy dissipation and is highly efficient in storing and transferring energy.
You may observe there is a relation between cross section area of conductor, length of it and diameter of the coils and all them depend of the frequency injected in the system.
When designing such a system you need to have in mind a desired output and know about load and its impedance, or how you are going to use the output if different loads are used.
Mainly this type of systems works and produce positive results based on frequency and voltage amplification or F and current, more complicated systems will work with F and V+C
So, regarding your system you have described above based on 2 mhz you need 150 m wire for each, if you halve it you are using 1/8 than you need to adjust everything accordingly.
Using much higher frequency will result in less wire to be used, also a square wave signal or slightly trapezoidal will improve energy extraction.
In order to be able to adjust your system you need to understand what each component is doing and what outcome is in different mode connection. I would recommend to start calculating your Q factor as you know what you used, it would be silly for me to start guessing.
While writing it just stroke me an idea that you may use chatgpt or similar to check step by step your system and once you know try to ask as simple as possible for interaction between two components you are using and always ask to double check as accuracy of such software instruments isn't great and do not account for complex interactions. Check if correct formula is used in your calculus and double check results obtained.
Personally i wouldn’t build anything before a great understanding of the system or principles involved, otherwise i would be stuck almost at every stage.
I would recommend to read the story of king’s army written by giantkiller on this forum and 7redorbs on overunity.com which may describe in a more understandable way what is going on in such setups, and when reading (be aware of long explanations) try to build an image in your mind of the things described.
When speaking about electrons try to visualise a long row of people with their hands up in the air and each one copy the movement of one in front with the same amplitude and orientation, than imagine a guy at the airport with flags in his hands indicate where and how the pilot needs to move the plane, than amply this to the row described, or imagine in AC two rows which interact with each other smashing or avoiding each other upon indications of large amplitude, speed or when two parallel rows are facing opposite directions (bifilar), where a phase shift indicate a certain delay for one of the rows.
Certainly if we attach strings to each one hands might help to reproduce the same movement at high speed in case one would have a different idea
and i am saying strings not rods because we aim for an harmony not segmented movement where all move in the same time.
After you built this image add a specific medium in which everything is happening, medium which itself have a certain density, viscosity
I hope from all my heart this helps.