Rear Axle Movement

[h2oking]

I installed a 9.5 AMM, 4 new autoride MR shocks, Hotchkiss rear sway bar, and Ground Force 2.5/3 spindle/spring lowering kit on a 2007 Escalade EXT. I have 24" Bazo's (35mm offset) with 305/45R24 FALKEN ZIEX S/TZ tires (34.7" diameter). I have clearanced the front and rear so that I have minimal to no rubbing statically. When one side or the other is under load and compression the rear will move forward about 1/4 to 3/8" which causes rubbing on the lower part of the front of the rear well. Statically I have about 3/8" of clearance between the tire and well. I have tested this several times on uneven hills (front up) and the rear end does go forward when compressed further.

 

1. Is this movement normal or is it a cause/effect of lowering?

2. Can it be corrected by using poly bushings in the trailing arms and are they available?

3. If I slot the upper and lower mounting holes on the axle about 1/4" to the front and use washers with a 1/4" spacer welded to them (filling in the area of the slot that is not used so mounting is tight and can't slip back, that way I can turn the washers 180 deg and reinstall axle in stock location) thereby moving the axle rearward, will it affect the pinion angle and handling adversely? And should I do both lower and upper or just one?

4. Do they make longer upper and lower trailing arms? I have seen some adjustable ones but they seemed quite expensive.

 

Any suggestions greatly appreciated. I do not want to lose auto leveling or change the equipment/tires/wheels installed. I posted on Tahoe/Yukon forum without response thus far but this forum seems to be more tech inclined.