Sounds like you've solved your problem, but I figured I'd throw this in for others. Best thing I've found to install grips is rubbing alcohol. Pour a capful in the grip, cover w/ hand and shake it up. Install fast, the alcohol evaporates quick.

Used to use the hairspray trick in the old BMX days. That works almost as well, but if the grips ever get a good drenching, they will sometimes break loose. Still a pretty good method though.