Good info there bill, though in general, I feel we shouldn't be wanting to run these packs to the end of cutoff anyway. Always noticed weird things in 1/8 if I ran cutoffs below 3.5V per cell. With the mains these days, not seeing a need if you size your battery properly to your car.
XRAY does make some good stuff, having had one I enjoyed its quality but cringed when it came time to replace a part and the sticker shock. Also, at least on the 1/10 side, nothing like getting 1-arm in a bag that costs more than 2 from someone else LOL. Packaging was nice though!