"He who marches out of step hears another drum." ~ Ken Kesey
If it's the performance poly garment like the under armour then our mesh counts are similar to yours, a little lower on the highlight but still close in ink deposit, 150/48 to 225 depending on detail and many other variables. The PITA poly shirts that are made to feel like cotton we go way down in mesh count to anything from 90/71 to 120/54 and they bleed so bad that we've had to go back to the underbase gray that we all hate to print but it's the only thing that will block the bleed without have 500 microns of an ink deposit.
We've been getting hung up on alot of the bella poly stuff lately.
how much pressure are you using on your squeegees? I found that you really need to back off and let the ink sit on the surface vs driving it in. Last run I believe we were at like 25 psi and a 70/90/70 squeegee.