Jerry
I know what your going through on the alignment lol i'm tuning up my old 10 fter and its a bull so i know that 12 fter is a pain .....i can tell you this that 7 1/2 fter would be easy to tune on

compared to the larger ones.
what i'm doing is tuning in the arc on c-band and will have to come back after i get c-band and try adding ku.
if rotating the dish slightly didn't work on ku signal and you feel sure that the feedhorn & scaler are properly set then you can try the method Lak7 mentioned .....
and this might be a tradeoff from one satellite to the next ( you might lose a bit of signal at one satellite to gain a bit on another)
you might try adjusting the elevation in micro adjustments one , two, three or even four nut facings of a turn and check your signals on several sats.