Are the springs behind or in front of the shoes?
Also, are the shoes the right way round? If you were able to adjust them properly i suspect they were. For the 110, a set of 4 shoes contains two shoes to face front (one each side) and two shoes to face rear (one each side). The way to tell which ones go front is that the distance from the adjuster to the shoe face is marginally longer (a few mm) on the front facing shoes and shorter on the rear facing ones. Like i say, i know this is the case for a 110, and may be the same for the 90 - it could explain the problems.