Congrats on a nice bike.
Some consider the Techusion gizmo to be a bandaid for the less than adequate Magnelli-Marelli Fuel Injection system. It richens the afrs a bit without conflicting with the ECM. Other tuning options are the Power Commander, Screamin' Eagle Race Tuner, Zippers Thunder-Max conversion kit, and a good old carburetor. However, if the bike runs well, LEAVE IT ALONE.
As for the rear steer, check tire pressure, wear pattern, and rear wheel alignment.
Enjoy.
Mark
Ordered me a power commander, it should be here tommorrow, hopefull that will get rid of the decel backfiring, other than that the bike runs great! and upon your advice ive checked the rear wheel, I found that the belt is awfully loose, is there supposed to be more than2-3 inchs of play when you press down on it? (i know the answer to my roadstar warrior is 1/2 inch with a tensioner tool) not sure what its supposed to be on a roadglide. Also found the adjustment bolt on the right side (if your standing behind the bike) is loose and you can move it a little. Any suggestions?