Dex does not need be higher than 16. I can easily hit 19 with tome. I think moving charisma with the cleric to 12 is prudent, leaving intel a dump stat.
The cleric has some issues. For one, there is no shot for radiant servant without empowered healing. That leaves divine might as the only decent offensive buff which requires good charisma for the +4 buff. A very high maintenance buff.
The favored soul on the other hand can get 7 or more 20 second action boosts for +5 damage. Plus, I can take the angel of vengeance PRE, which among other things buffs my BB. However, at 12th level there is only one 6th level spell.
So, I could stick with cleric, and
1. Forgo radiant servant
2. or drop maximize for empowered healing, halving my BB damage.
3. or drop improved precise shot, and take both empowered healing, and empower. Reduce dexterity to 14.
Or, go back to FVS and live with sub optimum healing.