I forgot...how do you have your setup....is it on top of your house or out in the yard on a pole? If it's out in the yard, I'd still get out there and tweak it some more. Your quality on RTV should be the same as mine, according to the footprint for AMC9, which is 70%. I bet you anything if you could get the quality up to 70% on that one, you'll be able to hit 72W. Assuming that the pole is perfectly plumb, as well as the motor's mount, it could be as simple as the elevation of the dish.
When you get your microHD, I've found the USALS works perfectly for me (except for Satmex 5, but that's a whole other monster).