"The time homoured way for a high release is to fly over the target at about 10K; roll over and look up (down ) through the canopy and as it passes under you; pull through to target"
Ya, I do this already from about 6k. Seems any higher and I end up compressing in overspeed. Even when I cut throttle before diving. Havent tried 10k in an airplane that has dive-brakes, though. I usually use the 110G for Jabo missions