Skill points, skill points, skill points.
 

I'm a level 31 cleric. 25SPR, rest STR.

My first 15 skill points: Heal SP consumption, Heal cooldown, Bash power.

My next five are tied up between:
- Heal strength
- Bash SP
- Bash cooldown
- Invincible duration

What would you recommend?

Well, my points are in Heal strength, SP, cooldown, and in bash strength and SP. I personally find decreasing the SP consumption of Bash more rewarding, but's that probably because I'm not the PvP kind of person. In PvP, the sooner you can bash, the better I guess. I can't be sure.

Improving invincible duration isn't something I really got around to doing, but I guess it might be rewarding, as long as it lasts 10 seconds normally. I usually grind in higher level maps, so the damage limit is exceeded before 10 seconds are up. However, I do want to improve it in the future, to help party members.

All the empowerments you've listed are worth empowering.

Depending if you're a party grinding type, you may want to consider saving 5 points for Party Heal cooldown at lvl 60.

But if you tend to solo, then that skill may not be as handy to you.

I didn't put in SP consumption for Bash, but that's because I rather have my points else where first, and burning an extra SP stone is something I can afford. I didn't increase bash cooldown either.

I think I'll do Bash SP and then Heal strength. I don't need bash cooldown with how often I crit anyway.