Any good updates? Did you try the trans. fluid? One other thing I would add is you may benefit from a free flowing exhaust, if you know what I'm saying. Paired with a suitable calibration of course and then if you tailored the cal. to 93 octane...These changes would show the best gains (especially for the money) and you would not have to go into the engine. I'd reference some other forums for better recommendations/resources calibration-wise.