I may get an IBS and just manual fill it for now. I just got a 400 lb eight.3 with WM elevate portable pump so i can play around with weight this spring, but it sounds like an IBS is a must. I saw a photo where you overlaid a fly high and Sumo IBS, i'm assuming you tried them both in the 08 LSV. Which one seemed to maximized the weight? It looks like the fly high isn't wide enough in the legs to fill all of the rear part of the bow.