Use 4 blade Stingers or 4 blade Phatheads. Both are essentially 2 blades with bleeders. I shoot low weight too and the last couple deer I shot didn't go more than 50 yards and I got complete passthru's.
Shooting low weight due to rotator cuff problems, I tried 3 blade Razorcaps once. Once and never again for my 35-42lb shooting.
I hit a doe in the heart at about 15 yards and the arrow only went in about 6"-8". Sure, I got the deer and she didn't go far, but my Stingers and Phatheads would have zipped thru on that same shot.
In my opinion, I'd suggest the counter-intuitive and go heavier with the light weight bows, instead of looking for a 400gr-ish arrow to gain some zip. I'm shooting about 550gr's out of 40lbs and getting super results.