Hi, bought a new Quarq elsa power meter crank with sram chain rings and the LBS can't seem to be able to figure out why I'm getting so much chain rub agains the inner large chain ring when in the small chain ring up front and when in 1st or 2nd cog in the rear. I know I shouldn't be in small in front and 1 in the back and a little rub against the inside of the front big ring is acceptable but the 2nd rear cog shouldn't have any rub/ grinding on the inside of the front big ring..This rub/grind would either happen or not in #2 cog but it was a 50/50 chance = often... Also once and a while shifting from 1 to 2 in the rear would send the chain off the inside of the front ring (dropping the chain) , even happen when I brought it back to the shop in the stand. The tech couldn't figure that one out.. What they did try was to add 3 very slim spacers to the crank to move the rings out , didn't help.. also took the 1mm spacer out behind the rear cassette in a attempt to lesson the angle of the chain , That didn't work either.. Anybody have a similar problem or have a solution ... BTW my bike is a 2012 cannondale evo with pressfit BB30 with ultegra DI2..