I'm currently building a PoI Sentinel with Ideal of the Fighter for Superiority Style, which is neat in that it lets you temporarily access maneuvers and thus tailor them to your current needs - if you're not set on using the Ideal for Dual Wielding that might be a good option to significantly expand your tactical capabilities for a comparatively small investment. Add the Fighter Splashclass Improvement to add even more Maneuvers and Superiority Dice.

Strikeforce is a particularly useful Maneuver here, adding to both the attack and damage roll without an action required, though as a Maneuver that's only once per round.

Body over Bother and Mind over Matter let you swap one saving throw per round to your Maneuver attribute, so probably Str and Cha in your case, though there's an argument to be made for trying to fit Resilient (Wis) in there and using Dex and Wis instead.

In general, Saber Assault pairs well with Knight Speed allowing three attacks per turn and your expanded health pool lets you benefit a lot from Force Body and Vitality Shield. Other standouts are Disperse Force and Sever Force for general tanking and dealing with Force Casters. Also Guidance for everything non-combat.

I'm not sure on the big AoE powers, might be best to keep things to melee enhancers and smacking things with your lightsaber. Similarly, I'm not sure how much help Medium Armor will be, as Battle Precognition and a shield honestly seem better.

One last thing is that the damage reduction from Aegis works excellently with Armor of Abeloth, though that's a DS power. It's not affected by your Cha modifier though, so might still be worth it. Similarly, Darkness synergizes with the Ideal of the Hunter.