I hate to say it but over spinning is the nature of the game for most people. I've actually experienced better blower efficiency with impeller speeds much higher than recommended with no adverse side effects. We spun my old X Trim well over 80,000 and never had an issue. It seems that the efficiency is more in line to the compressor maps once you start getting into the billet wheel blowers. Keep in mind that I have personally been testing blowers for Vortech for quite some time and will be at PRI with them in December out in Indiana.
You are correct to an extent. As long as you have a way to compensate for that additional heat then there really isn't a problem. This is via a tune that changes timing based on those higher iat values or some form of mechanically cooling the air. The guys in renegade have been over spinning the YSi's for the better part of a decade with insane iat's and don't melt motors down or a regular basis. They are not allowed to use and sort of intercooling device but to the best of my knowledge Bart Tobner still managed to go 8.16 with a YSi non intercooled and was able to back it up and that was a year or two ago. It's one of those things that's either right or wrong and without the right experience most people that are newly introduced to large amounts of boost have a learning curve and that's just the unfortunate truth.
