Yul, are all of those 12-13 97's in, more or less, working condition? I "have" about 16 of them, but four of them are now nothing but parts donors for the other ones. Of my 12 working guns, about 7 are quality enough to use in CAS, the others are too rough, don't always extract, don't eject strongly enough, or some other such problem.
Just wanted to let you know you aren't the only crazy person out there.