your cycle is basically just above a cruise cycle .. 300mg of test is high dose TRT (which is totally fine). 600mg of Primo is a good anabolic dosage. but your not going to get any androgen load or estrogen load from that at all. in fact you'll likely feel like your not even on cycle at all with that type of cycle (which is something that I consider a good thing, but only while cruising) . you'll think primo is weak. but its not. you just can't feel it because all it does is up regulate protein synthesis and not much else (you can't "feel" protein synthesis)..
I would add Deca to this cycle . works great with Primo to help sensitize you to estrogens anabolic effects (primo by itself does the opposite). I would then rotate in androgens or orals at various points in the cycle