I have an old Trek T-900 tandem that my wife and I ride quite a bit. It's got an 8-speed rear setup.
It's a standard (tandem) 145mm rear-spacing with matching hub, but tightening down the quick-release moves the derailleur hanger, screwing up the shifting. I can re-adjust, but next time I remove the wheel, it shifts poorly until adjusted again.
This is an aluminum frame, so re-spacing it isn't an option. Ideas of what is going on here?