Why do you wish you's gone for the 30mm variant? Looks perfect ride height on the Sportlines. No rubbing, and better suited to the standard shocks than the standard springs. I would recommend camber adjustable top strut mounts while you're doing the springs anyway, it is totally worth the adjustable strut mounts to ensure you can have the camber adjusted to OEM angles!
I work that out as a 100 pound saving, minus the the cost of wheel alignment, and thats still a 40 quid saving (mine cost me 60 quid for alignment. Front and rear toe adjustment). An absolute bargain in my book!:icon_thumright: