Grappling seems largely unnecessary IMO. You should be able to Charm or Suggest your way into a chain of Energy Drain-Suggestion.
Focusing on SLA strengths
Ability Focus, Sudden Ability Focus, Boost SLA
Improved Energy Drain, Spell Drain
As for Archery
Flyby Attack seems like a logical choice
Though, the old school use of Manyshot with it may be too harsh on your attack bonus.
A level of Fiend of Blasphemy will net you 2 cleric domains later in your career, qualified for pretty easily by taking leadership
Potentially continuing with it for spells may or may not be cause for switching up archery to Wis based/Zen Archery
There are of course some options for optimizing on your charisma in the X to Y thread, depending on what you want to dohttp://brilliantgameologists.com/boards/index.php?topic=215.0
Use Leadership & Spell Drain to sap spellcaster cohort for what specific spells you'd like personally?
Kind of rough, I'm at a loss after looking around.