GENERALLY on a FWD car you will get the most benifit out of fitting a harder rear sway bar, which will give you "lift off oversteer" and no, you dont necassarily have to fit a harder fornt sway bar.
dont worry too much about the rain due to your strut brace.
on a street car, id go not much higher than 2 degrees negative, and only really to correct any handling problems you have.
and now that i have said some helpful stuff (i hope)