I dunno about a 1.2 dish. It's solid and very watchable here @95W using a 7.5' on a Coolsat 6000, but @ 69-70 is is not far above the 62-63 threshhold. The Cailifornia Channel is listed as 'weak' and I have it just below ARTS at 66-68,same dish setup.
I havent had any co/cross ch interference on the 6K that I've noticed, and I'm shooting across several birds that are only a few clicks apart from my angle. While it is a relitive pain pinpointing on Ku, compared to C band, this 7.5 footer is kind of wide beamed. I cant see a 1.2 usable if there are birds that have adjacent channels in it's beamwidth that could overpower the one you want.
The channel is clear here, PQ is very nice, but I half keep expecting to see my o so familiar sparklies now and then. Just dont seem right to watch a ballet or an orchestra performance without them..........lol
(not a big opera fan, except for the browser!)