Venaci VS124, need higher side wall tyres

MYZ34

hi there guys,

i hope that the tyre guys here will be able to help me out.

i have a set of venaci VS124 in the following size:

Front: 20x9.5 (+11) with 255/30 tyres

Rear: 20x12 (+17) with 305/25 tyres

my question to you is i have a full amuse kit going on and tein mono-flex. And with these tyres, when the car is lowered there still will be a vearly large gap between the top of the tyres and the gaurds!, so i was wondering whether or not i can go with a 305/30 rear and 35/255 front with higher sidewall, or somthing a little bigger to fill the gaurds so i would'nt have to drop it completely on the ground?
also would you guys think i would need camber arms?

thankyou in advance for any suggestions