I have the same grips, one side I put on without anything, was a pain, the other I put a bit of copper grease in the grip and it slid nicely. Moved about a bit afterwards which was fine by me, more settled now but I reckon it will get off easily if I need it to.
If you don't want to keep them, cut 'em off.
If they're knock-offs they're cheap right? They are, clicked.