Well, nevermind. Looks like I can't shoot an arrow weighing less than 420 grains, anyhow. Good thing I looked at the regs again.
Washington is a 6gpp state.
Way to go in considering all angles. I had not even thought of state regs when considering your situation. I was going to ask what setup you were using but it is pointless now.
...and just for ....s and giggles you may have wanted to run the numbers through one of the trajectory calculators to see if it really would have made that much of a difference. I remember several years ago I was enlightened to the marginal increase in trajectory even a fairly large increase in speed made with most hunting setups.