My doc is diligent about scarring and she had me keep soft paper medical tape until 4=5 weeks, only after that did the nurse say I could switch to silicone. All the little scabbiness had to be gone. But the paper tape stops the edges from micromovement that can allow openings.
I tried so many as well, finally settled on a soft cotton zip front from Jockey. I could wear the nylon Wanayou zip front only if I put on a soft cami under it. For the record, I measured 32-34 underbust and 35-37 overbust and bought both in Large.