I used to have 2 sided mtn bike clipless pedal on my roadbike...then I upgrades. Problem is, these new pedals are too heavy on one side and tend to tilt back. I have a harder time than I'd like trying to clip in. I'd like to adjust them to stay more "flat". There is a black ribbed ring labelled "tighten" (not what you thread them into the crankarm with) but it's at full tight I loosened it and tried to reposition the pedals but it didn't seem to make a difference.

Any suggestions?