I have shot a 40# longbow all season this year....and I only draw 27". I have taken 5 deer with this setup....including one big bodied mature buck.....all had two holes in em.
I shoot a sharp two blade broadhead...with a very well tuned arrow and keep my shots reasonable....for me and my setup its 20 yards and in. And I feel very confident in the bow and its poundage doing the job...as long as i do mine.
If I was hunting anything bigger than deer I might move up a few pounds....and I am very capable of doing so. I just dont like to shoot heavier poundage bows....so Im gonna stick with my light weight rig. Works for me!