Hi,
I've had long (>68") flatbows, especially hickory, with propeller twist. If it's less than 1/4 twist at full draw, I honestly couldn't tell the difference in performance or accuracy if I removed it. Some I've left, others I've fixed, and it didn't seem to make one bit of difference. For some people, me included, it looks bad. I've removed it with direct dry heat (heat gun) and veg oil, using a large C clamp and a 1 gallon plastic milk jug filled with water as a counter weight.