Actually if we're comparing Ep.2 Anakin, and you say that Bastila has more control over her emotions, I think you're dead wrong. Why? Bastila fell to the dark side, Anakin did NOT (not til Ep.3). So you lose the "who has more control of their emotions" argument.
Also, Sentinels aren't focussed towards Force skills, they're balanced. It's a Consular that is Force strong, so your argument about Bastila being stronger because she's a Sentinel is wrong too.
There's just no proof that Bastila is as good as you claim her to be. Every time she's confronted with a battle, she ends up getting captured.