first of all I switched the qr to an internal cam shimano xt. I put the grease inside the chainstays where the hub meets the frame and inside the chainstays where the "axle" contacts the frame. I didnt put much or any grease between the qr – frame -connection.
I also took off all the chainring bolts and went quite overboard spraying the grease between bolts and chainring arms; and between chainrings and spider.
I had a very similar sounding issue to you, it was driving me crazy. In the end it was something to do with pedal axle / crank - cleaned and regressed and this resolved the problem.
first of all I switched the qr to an internal cam shimano xt. I put the grease inside the chainstays where the hub meets the frame and inside the chainstays where the "axle" contacts the frame. I didnt put much or any grease between the qr – frame -connection.
I also took off all the chainring bolts and went quite overboard spraying the grease between bolts and chainring arms; and between chainrings and spider.