RE: what length?
I will tell you right now you won't gain enough speed to make it worth your while. You won't even be able to the tell the difference without a chronograph. It will not change you trajectory or sight settings at all would be my guess.
The only reason to cut your arrows would be if they did not spine correctly and you couldn't get them to tune. If it shoots well I would just leave it alone.
That's my opinion anyway.
Paul
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I didn't climb to the top of the food chain to eat carrots! (Ron White)
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