mine is lower then "recommend" at the front and its sweet, I was using 19x8.5+0 with a 245/35/19 scrubes over everything but looked so good I didn't care haha, depends what your willing to put up with form>function haha
I wouldnt use a 10mm slip on. I am using 20x8.5+7 scrubs a little over big bumps I did 20x8.5+17 and no scrubbing whatsoever.... Both with 225/35/20 tyre !! And by that I mean 20x8.5+42 with a 35 and 25 mm spacer !! If I were you I would go 15mm bolt on spacer if you don't want to go as far as a 25mm, you need to remember tyre plays a big part also !! You said u had a 225 tyre? 15mm spacer will be fine
I have the same, 5mm spacer will work, or you can be like me and use a 35mm spacer but will need to roll, or just use a 25mm spacer, and no need to roll.