Donald,
on these shoot arrows , I'm a novice but i'm finding I like to work with two at a time.( i mean shoot two at a time)
One I know their characters and recognize their fletching, then i''ll work out with two more till i know them.
once i'm familiar with them all, i'll toss them all in a standing pvc at 20 yards and pick randomly, take a look at it
and remember its character. some fly so identically it doesn't matter.
One of the darker ones fires like a bullet, the other darker one is actually still a mystery...even after 100 shots
not one i'd take hunting.
I guess i just assumed heat was best, but i can try a little cold tweeking!