Bubble lasts through 1 good hit, then the sorc/sage goes down pretty quick. If you can't do enough damage to out dps a sage/sorc you probably want to respec.
No... sometimes I'm solo pvping and my guild is asking for someone to come help pvp in a premade. Obviously, I'm going to quit playing with people I don't know to go play with my friends.
What hybrid build are you using to 4k+ crit with Sage? I'm a hybrid and have mostly crit stacked pvp gear and the highest crit I have ever got was 3.9k. Most of the time they're 2.5k-3.5k.