10% is when things work right.
Those who are hypothyroid are very often non absorbers.
Some absorb well in the beginning. But the skin changes with the testosterone and can then not absorb. They can have T level lab work that is very good, then they start to feel like its not working anymore... and lab results confirm that.
You did not post your age or anything useful. If your skin is aged, thin, crinkly or fragile, you might see thickness and elasticity return in six weeks.
Injected T can be a lot cheaper than transdermals!!!
Those who train, sweat and shower are not good candidates for transdermals.
E levels can rise more with transdermals than with injections. If T levels are good and stay there, you can expect to loose the benefits from elevated E2. Get E2 tested and use an AI, arimidex/anastrozole specifically. The typical starting dose is 1mg/wk. Aim for serum E2 in the low twenties (0-53 range or <54 range)
If the TRT is effective, your HPTA will shutdown, you loose T production and most of your pregnenolone production. Your testes and scrotum will shrink. A few also feel a 24x7 ache in there testes. The only delivery mechanism for HCG is injections.
DHEA levels are underminded from the drop in pregnenolne. Injecting HCG will keep the testes working [if they area able]. But its seems crazy to do injections to keep the testes working and also use a transdermal to avoid injecting.
In my view of things, T, AI and HCG are the three legs of the tripod. You need them all. Many doctors do not understand these issues and may think that AI and/or HCG is insane... because they simply do not know.
The right doctor is the key to success. Many have trained their doctors and many many doctors will not accept a patient telling them anything, their egos are threatened.