arcane concentration / spellslinger - not balanced

Spirit is sadly one of the worst stats. Big mana pool is not very useful, mana reg is important. And spirit does not give mana reg for some reason. In long / hard fights you have to drink tons of mana pots and they become more and more useless with bigger mana pool. arcane concentration costs 5 (!) talent points and gives minimal spirit which gives minimal mana. not worth it! (e.g. at flame level 4, you get 2 spirit, so 80 mana)
spellslinger: you get 5% STAFF damage for 2 talent points ?! just skill 1 int for 1 point and you get 5% to all spell damage. not worth it

suggestion:
- 1 spirit gives 2 mp5
- arcane concentration costs: 1-2 talent points
- arcane concentration: get 1 spirit for 1 level of flame
- spellslinger should give 10% / point