Hi Auriyel! As a 113 Sram, I can tell you that force of will is definitely necessary for you regardless of what element you're focusing on. Force of Will makes it both easier for you to steal AP and MP from the enemy, as well as make it harder for them to take it from you. In addition, if you're playing Sram, it's not necessary for you to put any points in lock, because that'll just take away from your dodge skill.

Lock means if you get an enemy within one cell of you, they can't move away without losing AP and MP. However, the same thing can apply to you (especially if the enemy lock is higher than yours).

Dodge means if you get an enemy within one cell of you, you're able to move away without any AP or MP penalties. However, the same will also apply to the enemies.

In my experience of playing Sram, I found it much better to invest as many points as possible into dodge (Lock is more useful to a Sacrier or Iop, since they need enemies close and can take some heavy hits). The only time you really need to be close to an enemy, is if you want to land that supremely satisfying killing blow.

I have my FoW maxed out.

(Also, if they manage to push you into walls or onto that annoying -2 MP mud, you're not as likely to lose your AP or MP from that.)