the sway will make quite a bit of difference, just don't go too big. nothing more than 24mm-25mm imo. with the stock 21mm front bar.
I personally run a progress 22mm on the rear with stiffer H&R race springs, alot depends on your driving style a bit too.
the focus is deff. a front heavy girl, i removed my rear seats & spare tire 2 seasons ago and noticed quite a bit of off throttle oversteer in faster sweepers & transitions and adjusted tire pressures & shock settings to compensate cause the focus def. needs a diet.
this winter i decided to shed some weight from the front , lost the A/C compressor and condensor since my down pipe for the turbo wouldn't clear anyway..that's almost 50 pounds, then i dumped the stock battery for one smaller and half the weight..lost another 15 to 20 pounds right there. I didn't realize the stock batt. was so heavy..lol
this should help balance things out nicely
our first race is soooo far away :-(