It is worth those trips back and forth, to and fro, because when you finally get it peaked as high as it will go, you will get every channel up there available.
I found while I was getting some channels, I was not getting them all. I had tweaked the dish and mount, but not spent enough time 'calculating' the focal length. Make sure you set it according to the calculations for your dish. I had my 7.5ft at 0.42 and calc's showed 0.38
Once I set it correctly, everything starting popping in from 72W to 139W.