My dd needs to see as much live pitching as possible mainly for timing issues. Is it ok for me to pitch overhand to her from 43' or will I be causing more problems than good?
I throw overhand from a knee closer than 43 behind a screen, and I love beaning them once and a while, it's the only joy I have!
No. It doesn't matter at all whether you throw overhand or underhand. Do what you can do. Sure, if you can pitch windmill, that is well and good. But front toss, no matter how it is thrown is great. I have heaved tennis balls to my students for 30 years. I am not at 60 feet, pitching. I am behind an L screen, at about 30 feet.