Try checking if your crew is handling the sheets right after drop off. Sometimes damage happens on site, not during shipping.

Doubt warm-ups matter, mine runs fine without.

Honestly saw a tip online once about taking a cold shower first thing when you get home, no hot water at all. Something about cold closing your pores so the fibers can't dig in as deep. Tbh I've also heard rubbing talcum powder on your skin before you suit up can help, like it fills in the gaps. Ngl though, sometimes you just gotta suffer through it and slather on that calamine lotion after.