I take undecanoate and think it's massively superior. I skimmed over what you wrote, and just comparing your experience to mine:
- Far too frequent. Undecanoate half-life is 15-35 days depending. T should be dosed at 1/2-1 of the half-life. I get away w/ once every 2 weeks, which happens to be the right amount to throw in an insulin pin.
- You could try lowering your dose 10-20%. A rule of thumb from the regression equations from the studies online is that a dose of C/E will put your AVERAGE T at 8-9x the weekly dose. 100 mg/week for 800-900 total T avg. Will vary greatly each week. Given the higher ester weight of Und, it's probably ~7-8x, which is right were your results are. It'll be easier to see this w/ the longer ester. You're on ~13 mg/day free T, which is an amount rarely achieved by natural adult males. A bit less would put you ~1,000 and might lower E a bit, which could possibly do what you want.
- If this doesn't work then it's probably something else, assuming anything is in fact off. From years of being on these various boards, probably 70% of the postings are people tinkering w/ a single hormone while missing other things wrong (insulin resistance, thyroid, vit D, stress, inadequate electrolyte intake, zinc/iron/copper deficiencies, no sleep, etc.). Just my .02 there.