Welcome aboard sparkie! I can't hear that now and not think of Ron White.
I do not own, nor use polymer mags, but I'm quick to repeat what others have said: Don't store them too long, fully loaded, so as not to put too much strain on the lips, lest their spacing slowly get loose. Sorry to hear about you experiencing feed problems with metal, single stack mags. Most seem to be hit or miss without a little tweaking as discussed ad infinitum in this thread.