I'm about finished with my superXtra and what to know what the thrust line offset is.... 1deg 2deg? I know it's different for every motor and battery combo, but I'd like a good place to start. Should I just go ahead and put a washer under the left two motor mounting screws? BTW I'm using a motor that's about 220 watt

Yes put 1-2deg into it, on my personal planes I just eyeball them to make sure there is some right thrust in the mount.