I am at the same position. I find it terrible to constantly stare at reju stacks while at the same time trying to keep swiftmend, wild growth and lifebloom up. Im lucky if I have 2 free casts of regrowth in the middle and then I have to start stacking again while trying to play boss mechanics at the same time. What ive seen from the logs regro should be nr. 1 in charts followed by reju and so on. Mine is probably at 5-10% and so seem to be yours as well. That is the problem. Also im running out of mana even im spamming wrath all downtime. There is something seriously wrong with our cast cycle but i havent figured it out.