In 1 month I lost a ton of hair on "the safest hair compound", anavar. But hair may not be a deal breaker for you.
Not sure about the narrow window you speak of. I know when I started TRT my doc prescribed everyone's favorite, T Cyp, which made me feel like shit. I gained a little mass but felt horrible; even adjusting from 100 to 150 to 200mls.
6 months later I self prescribed Sustanon250 and finally understood what everyone raved about regarding TRT. It was awesome. For 9 months. Then more hair shedding, oily skin, acne, backne, everything that could go wrong did.
This shit is so individual. You might just want to revisit the test.
