It is ideal to maintain low normal E2 (estrogen) level while on cycle to minimize bloat, eliminate the possibility of a gyno flareup, and to maximize libido. Normally as the level of testosterone in your system increases, some of it aromatizes to estrogen pushing up your E2 (estrogen) level.
Some people are more prone than others for excessive aromatization. Pretty much everyone benefits from using an AI to manage this phenomenon. Adex or Letro procured from a chemical research lab (google either compound and research chemical) are the compounds of choice since they are quite cheap (about $60-$70 for several months worth).
Adex sells for $70 for 60 ml at 1mg/ml at one particular source. The real pharmaceautical arimidex tabs cost many times that amount for the same effect.
At 3 weeks in you have really only experienced the aromatization from the test prop as the cyp takes several weeks to make its effects felt. Then after about 6 weeks, the decanoate will add to the aromatization. Then it will slowly taper off after your last injection.
In other words gyno could still present in your case. The Nolva will protect you against a flareup. If one occurs, take 40 mg/d for a week and then continue at 20mg/d until it abates completely. You will notice nipple soreness if this happens. That precedes the formation of of tissue buildup beneath the nipple (bitch tits).
Prompt treatment of the nipple soreness will prevent any further progression to tissue buildup. The Nolva can handle that, but it does not maintain low normal E2 level (optimal for men) and the benefits I described above (libido, mental clarity, no bloat, etc.).
AIs (Adex and Letro)and SERMs (Nolvadex, Clomid, Torimifen) each have their own specific uses and purposes. AIs to maintain optimal E2 level and the benefits that go with that and SERMS to quell a gyno flareup and for PCT.
For your cycle Adex should have been taken at about 0.25mg/d and adjusted up or down depending on how you specifically react to Adex dosing. Some require more than others, but 0.25mg/d is a good starting point. Lower Adex if you get achy joints, mental fogginess, low libido, cranky morale (means E2 too low).
Increase Adex dose if you get bloated, feel sore nipples, low libido, emotional (means E2 too high). Maintain perfect dose if libido is great and mental clarity is good and bloating is under control (means E2 is at ideal low normal).
If you decide to start Adex now, you should frontload it on Day 1 of its use at 1mg, then 0.25mg/d and adjust as needed. If not frontloaded, it will take about 1 week for the full dose to kick in fully. Continue the Adex through the waiting weeks as there will still be significant test aromatization occurring.
Oh, yes and talking about frontloading that is a good idea when employing long esters of testosterone for relatively short cycles or even for longer cycles unless you prefer to wait up to 6 weeks before the full effect kicks in. When frontloaded, full effects materialize much faster.
I failed to point out before that for the decanoate ester a cycle length of at least 10 weeks would be neccessary to reach full effect to any degree of functionality.
A 6 week cycle is very ill advised. Also another disadvantage of the mixed esters is how that complicates frontloading as there is a particular calculation for each ester. Prop kicks in even without a frontload in about 1 week or less. Cyp takes up to 5 weeks without a front load.
Decanoate takes basically forever. Had you frontloaded Cyp for instance, it would have kicked in in about 2 weeks or so. Decanoate is basically not used to any degree since it takes so long to recover, canbe detected if tested for so long, takes so long to take effect (many disadvantages compared to shorter esters).
BTW, if Westclock said an AI was not necessary, it would certainly have stemmed from your using the term T4 and him not knowing that you were indeed using testosterone which aromatizes. Anavar alone does not require an AI. Westclock knows his stuff.
So much info, so little time…