I've never hunted with a broadhead that weighed over 125gr so I'm kinda new to using anything heavier. I plan on using some new 185gr Silver Flames with a 1 7/8" cutting diameter this year for Elk and want to match it up to the right spined arrow. I'm thinking of using the new Easton camo FMJ's in 300 spine and keeping the arrow long enough so the broadhead doesn't reach the shelf at full draw. I would imagine my finished weight to exceed 500 grains and I'll be using my Envy to fling em. I think I should be in the mid 270's for speed. Will this work like I'm thinking??