T-gels create more E2 and more DHT. T-gels create large swings in T levels, especially FT, between applications.
Weekly injections or longer create peaks and deep troughs.
Injecting twice a week is better. EOD injections are very steady.
Self injecting should be cheap. Perhaps T injectables are over priced there.
High T% creams cover less skin area, E2 and DHT will be lower. Apply to inner arms and some on scrotum with the hair clipped short for more DHT.