I feel your pain. I've got tons of CCI 10s and 11s - one is too small and the other too big, except for a couple of guns. I either squish or push hard with an unsharpened pencil, neither of which is optimal.
Seems to me that if you've got the time and patience to crimp those #11s down a bit, it's probably worthwhile.
Well we don't rent pigs and I figure it's better to say it right out front because a man that does like to rent pigs is... he's hard to stop - Gus McCrae