Took about 5 hours of barspell spamming to cap from 91-93. I wouldn't be surprised if other buffs have a higher skill rate, particularly those we can cast on others, but self-target stuff is certainly cheapest and not reliant on others. Snagged a couple levels into 94 for about 40m of casting. Definitely liking Conflux 11 over the others for RDMing even though I haven't seen a single new scroll in over 20 runs.