The biggest mana pool is not the whm... The AST has more piety and should be play with piety
SCH and whm got some useful instant mana regen
But AST with ewer and CO have the best regen mana

But in fact
TM do need a lot of regen due to his skill...
Between swiftness and the huge number of skill...
TM might be a healer that need to DPS to heal correctly... So forces to stance dance.
=> he might need his own stance... Like a slow/speed stance duality