So I played the show on Saturday, through the Orange 2 x 12, don't know if it was the Jim Root one cos it looks different, so it could well have been V30's. Anyway's it was fine, no issues with the wattages or whatever, and I only needed the volume on 2 like expected to hear myself and be in the mix out front.
I know its a festival but how are you meant to get your tone in 5 seconds when the sound engineer calls for your guitar? If you start playing during the kick drum being soundcheck you'll obviously be told to be quiet.
I found my sound was nice and bright, maybe I should've whacked the resonance up a bit to make it more darker (it was 6/7), had 2 monitors in front of me, for my side of the stage. Fairly even levels of EQ, bass/mids/trebs on about 6/7. Went easy on the gain, as I used a Tubescreamer to tighten up the flubby tone.