Yeah I have been running my 4 blood RK + retadin and am able to steam roll through UK and make it through in 20-30 minutes a run. Hardly pop any CDs (Ghoul, dreanei ability, etc...). Still getting good XPs per mob. Around 1300 XPs non rested and 2600 rested. Bosses give around 10-15K each if I recall. If I had more time I could probably grind out a level a day.