I'd definitely upgrade, and you can do it for not that much money. You'll definitely be picking up energy with a newer bow, and most likely get many more pass thrus. But I am suprised you didn't get more even with your setup. Although like Rob said, nothing is a sure thing. Much more goes into pass thrus than pure KE. How well the bows tuned, what it hits going thru, broadhead type, etc. How high do you get in the trees now? I'm up there around 18 and never felt I've needed to go lower to get better penetration.