wooo!!! congrats bud!!!!!!
My incubator is at 89.5 degrees. As for humidity, I use large 20qt tubs and seal them with glad press and seal. So my incubator is at room humidity, but the tubs are at 100%. I don't know if 91 is too hot or not, but I know 89.5 has worked for me as all my eggs have hatched without any issues.
Good luck