"Going to see if I can get to the archery shop and shoot them through a chrono."
Hmmmmm, might make a point to not do that. Lots of guys get their bubble busted when they shoot what they think is a good shooting setup over a chrono.
As for shooting them better, I know a lot of guys who say they shoot a slow bow better than a fast one. Personally, I think it's a matter of being better able to see the slow arrow go to the target compared to a fast one. It lets you learn the path of the arrow easier and thus you instinctively line things up and shoot better. It also has to do with trajectory. A slower bow requires you to shoot with more of an arc in the flight of the arrow. This brings the arrow path up into your line of sight sooner. Watching the slower arrows is easier because of it. Seeing their path is thus easier so aiming them is easier too. At hunting distances that is. When you have to shoot far, a flatter shooting bow is easier.
For that matter, I've found that I can change any one thing about my shooting and experience short term improvements. Doesn't matter if it's my release, follow through, arrows, bow etc.