Like a lot of S2, Careful tweaking of the dish and feed horn (FL ,F/D and centering) for maximum performance may be necessary. Another thing that will likely improve performance is a C band only LNBF. Dual band models sacrifice some performance in order to work both bands. And for the ultimate, an orthomode feed horn w/ 2 LNBs.[$$$]
BTW: I don't know for sure if the S12's Q meter is a crappy as the S9. But if so,(and I think it probably is) it may not be a very good 'tool' for tuning. I, and many others, share this opinion.
Then, to add to my confusion, Satbeams shows a Hemi East and Hemi West beam, while Lyngsat just says it's a single Hemi beam. Which, wha- is on which, or is there really only 1 beam that covers the E and W as shown on Lyngsat? Hopefully someone here chimes in that has that satellite in their inventory. (I'd have to modify my polar mount quite a bit to get that satellite)