HCG is not suppressive per se and should be used on cycle for maintenance of steroidogenesis (hCG, as long-acting LH, stimulates Leydig cell T secretion) & somewhat inconsistently, basal spermatogenesis. Ideally hCG can be used (understanding fully its practical financial expense) in combination with hMG (a combination product of LH & FSH [the latter which stimulates SHBG & Inhibin secretion from the Sertoli cells]) to maintain full HPG axis functioning (steroidogenesis, or T secretion & spermatogenesis, or fertility) and to make transitioning from exogenous AAS to endogenous T secretion painless.
Now, it's true that blasting extremely high dosages of hCG can stimulate supra-physiologic T secretion, which negatively feeds back on its own secretion, thereby exerting a suppressive effect (delaying recovery to a eugonadal state). HCG, too, stimulates aromatase activity (T ⇒ E₂) in Leydig cells, with the resultant pharmacodynamic effect being that Plasma E2 & E2/T ratio peaks on day 1 after hCG administration, whereas plasma T peaks later on day 3.
As you experienced, Dr. Scally's POWER PCT (2.0?) Protocol, plain and simple, helps people. It makes sense for those that require a sometimes frantic solution having not prepared to come off from their cycle beforehand (but may also be used by those not well-versed in, or even skeptical of, maintenance prior to cessation). It, from memory, is a protocol that involves SERMs & hCG administration (perhaps too an AI? I forget, doesn't matter). However, neither SERM (nor AI) use actually solves the problem of restimulating HPG axis (steroidogenesis & spermatogenesis) functioning post-cycle. This is because AAS-induced (acquired) secondary hypogonadism is characterized by low or normal LH and FSH (with normal being inappropriately low in relation to T) and
low estrogens.
SERMs might cursorily seem to be perhaps useful in this state since they function as ER antagonists at the hypothalamus/pituitary, increasing LH and T secretion. AIs by blocking aromatase action (T ⇒ E₂), thus reducing the absolute concentration of E₂ (effectively reducing its inhibitory action at the pituitary), thereby increasing LH and T secretion. And yet the steady-state nature of primary or secondary hypogonadism is quite distinct from the transient secondary AAS-induced hypogonadism that occurs post-cycle.
So, AIs and SERMs both act with respect to the HPG axis by reducing the action of estrogens on the hypothalamus & pituitary. While SERMs in particular can be useful for gynecomastia, and likely make you
feel better temporarily by increasing LH & T acutely, these drugs just do not actually counteract the suppression by estrogen on T production at the hypothalamus & pituitary because, post cycle, estrogen & T concentrations are very
low already.
Thus, it does not follow that blocking the suppressive effect of estrogens at the hypothalamus/pituitary with a SERM or AI would be of benefit, when the stimulus for T production (i.e., low concentrations of estrogens) is already present. Instead, they probably delay somewhat actual recovery when used post-cycle (by increasing T secretion acutely) but serve to reduce the discomfort of low T (symptomology).
Conclusion:
After that tangential rambling (mostly done just to go over the processes in my mind and to make sure that I better understand them each time that I discuss them), the
takeaway should be that hCG & ideally also hMG are vital for maintaining full HPG axis functioning (steroidogenesis or T secretion & spermatogenesis or fertility), and the best practice for those that come off from AAS completely is, in my view, to maintain while on cycle with the two, where you should find that you essentially experience no symptoms of low T or infertility after dropping all exogenous hormonal drug preparations in due course. Peter Bond has proposed a protocol for this, here:
[source] & I have proposed some practical examples here:
[source]