alright as far as extended studs go i wanna say with up to 5mm you dont need extended ones. also even with 255/35 you should be able to go pretty low with a little tuck just run -2.5 or so camber and you should be straight. the offset on the grids are pretty week so dont worry about it i would just roll your fenders and maybe a slight pull if needed. im running 17x8 g forces with a 25mm spacer to make it a +23 offset right now with my megan coilovers maxed out and im not rubbing at all. if you going for hella flush the grids can work but the offset is alittle weak. you should get some 18x10 +25 miro stp-1 like im getting. here is a pic for reference.



also here is a thread on nasioc that you can check out which is all hellaflush cars including quite a few running grids. these were my original choice but after seeing them they are not wide enough.
The Church of the Soooper Stanced Scooby - NASIOC