Glad to see you got positive results even though it was a bit unconventional.
You are still not locked onto F2 well enough to call it good but you are close. Some specs say a 70 on signal strength and 6.5 on ECBno is the minimum for any channel. Now all you need to do is tweak the dish.
First mark where you are so you can get back there if you somehow mess up. I've found an easy way is to go to the worst channel (transponder) and try to dial it in. It's more than likely an F2 HD channel. You may find the SD values degrade a bit when you are done, but it's better to have a stronger HD signal as it takes a stronger signal (relatively) to maintain the HD picture quality over an SD signal.
Is it warm enough there to go crawling around the roof?