OK, take the stabilizer out and start over. Get a heat gun, and get the joing really hot, the epoxy (I assume you used epoxy?) will soften and you will be able to pull the joint apart. Then, fix the problem. if you have to, glue some wood into the slot on the high or low side so that it will level it up and you will still have something to glue the stabilizer to. Does that make sense?
you may ruin the covering in that area where you are applying so much heat, but covering is easy to fix--much better than the situation you have now, and I believe that when you first opened it, it was Dave Pattrick's to fix, now that you've assembled it--knowing it was off, it is yours to fix.