Yeah, I would suggest to improve your turning accuracy. Try to solve, slowly, such that you never lockup. Also try to never have your cube do the spongey sort of cut corners. I used to cut corners a lot, so if you do I think you'll know what I mean. This is where, in cutting corners, the corner itself sort of comes out of it's place a bit more than it should, but there is no pop. Try to make sure your cube stays solidly formed during all turns, which can also improve your turning accuracy and your speed.
Just my thoughts, I'm certainly no expert for speed 3x3, but hope this helps.
Chris