I don't even play THM but considering how fast I burn MP as CNJ it must be a pain to play THM. At least CNJ has Shroud of Saints for MP regen and Blissful Mind for pooling it. Because of that, CNJ can maintain MP really well (you do burn out eventually, but smart use of combos, Blissful Mind and Shroud can keep you going a long time).
I'm honestly surprised that Blissful Mind is a CNJ skill since it sacrifices HP. I would've thought that was more appropriate for THM personally. Something needs doing to help THM out; either bigger MP pool, MP reductions for combos or just giving THM an easier way to build MP without standing around for a while.
Honestly, just giving THM access to Blissful Mind would help a lot.