It looks like I stand corrected on the speed issue. With that being the case you should have more than enough energy to shoot those broadheads, and just about any broadhead for that matter. I'll be switching to the same broadheads this year to change things up. I've been shooting Spitfires, but I like the bigger diameter on the Grim Reaper extras. As far as your outer limits go, it will always depend on the situation and you have to trust your gut. If you practice enough 30 yards should be well within your limits as long as the situation is right (relaxed deer, little wind, no obstructions, etc.).

Good luck.