[FiliaChan]

Personally, I wouldn't waste skill points on heal, even if you still have your re-skill from your job change.
The pang's buffs will help you till 30 and its accuracy still helps, though it's not the best ever.

I'd go 1v1 till 28, though it requires a bit of patience. Partnering with someone may also help in the right circumstances. As I see it, getting to the lowest level AoE skill any class can reach is going to be enough of a reward, regardless of whether or not you decide to just heal someone till that level.
However, as an AoE assist, you'll need a lot of skill points to add to Heap, Beef, Burst Crack and Stonehand. Perhas even Mentalsign for longer buff timers.