I'll post my numbers here to add to
@FunkOdyssey 's post.
With TT = 1700ng/dL and FT = 37ng/dL on what I think was 22 or 24mg/day Test C, my E2 (always sensitive) was 70pg/mL.
On non-scrotal cream, with TT = 2100ng/dL and FT = 68ng/dL, my E2 was 40pg/mL. So with FT exactly half of that on injectables, my E2 was almost double.
I had other labs drawn on non-scrotal (half the dose as the one of the results above), and E2 was again very low compared to equivalent FT on injectables.
However on scrotal cream, with TT = 1100ng/dL and FT = 25ng/dL, E2 was 55pg/mL.
All results are LC/MS for TT, equilibrium dialysis for FT, and (ultra) sensitive assay for E2. All results are also trough levels 12 hours post application as I was doing 2x/day dosing on the cream at the time.
As a quick aside, I've moved to once/day dosing of the cream, scrotal for now to start at 2 clicks (100mg total) and am having really good success, feeling in every way much better than on any protocol using injectables.
Some slight E2 physiological sides (water retention, spicy nips) and a little overemotionality, but lots of energy, very high and aggressive libido, and cognitive function is the best it's ever been on TRT. 4 weeks so far on this protocol and will run labs on Monday for peak and trough levels.
I do think that once/day application is key for me as more steady levels always lead me to not feeling as good, and on injectables like absolute garbage.
I'll test non-scrotal application and some mix of scrotal and non-scrotal in the near future, but so far this is working well enough that I have no intention of ever going back to injectables.