So I bought my ZF2 recently, and had it restrung straight out of the shop. The stringer bent a lot of the strings. I'm assuming this effects the sweet spot. How bad would it be to straighten them?
It's perfectly fine to straighten them mate many stringers straighten them before they give the rackets back.
just straighten them. would be nice for the stringer to straighten them as it would lose a little bit of tension. but it is not a big deal.
If you're lazy, I once intentionally bent my strings to avoid wear, and they seemed to straighten themselves!