I recently put a 1x12 on my 2013 giant trance. I have the gx rear derailleur gx with a raceface direct mount crank with a 6 mm offset chainring. When I pedal backwards in 10th 11th 12th largest cogs the chain drops down to the higher gear. I though with the 6mm offset it would improve this problem but still occurs. Has this happened to anyone who has upgraded to the 1x12 aftermarket?