I'm pretty sure Fett's ability plus the navigator's stack since the rules state that when multiple abilities resolve simultaneously you can choose the order to resolve them. However, you wouldn't be able to boost twice with PTL since you can only take an action once per turn. As for what else to add, I would suggest either 2 alpha interceptors with stealth on one to come in at 99 or 2 academy ties with dark curse or backstabber, also at 99. I don't have any experience building 150 pt lists yet.

My 2 cents