Unweaving with auto advance

I can't be the only weaver who needs to unweave on occasion...but it can be a challenge due to the auto advance. Does anyone have any tips or tricks to make the process easier? Currently after unweaving, in order to get the cloth back to the correct fell line, I disengage the auto advance, take the weight off the cloth apron advance and let out some of the apron advance string, roll the warp back onto the warp beam (adjusting the tension arm) and then re-engage everything and try to position the fell line at the correct spot by advancing the breast beam....and I'm not usually very successful and end up with obvious spaces. I have been wishing for a reverse switch on the auto advance! I love everything about my AVL except correcting my mistakes. Tips? Helpful hints? Thanks Sheila