Use this tool to straighten both the blow and draw reed plates.
https://harp.andrewzajac.ca/FLTPK
Straight, flat reed plates together with a flat comb are essential parts of establishing the best framework for the reeds. With a good frame, reed work becomes much simpler because all sides of the slot are at the same level and are well supported. Even a thousandth of an inch of space between the comb and reed plate means the reed will be less efficient at converting air flow into decibels. A good foundation is mandatory for best results.