Octavia 2.0 tdi getting most power down and bushes problem

Hi all. This is my Octavia,croatian elegance model. I had a remap done fitted a whiteline lower control arm anti lift kit and adj. Roll bars.....i have an issue with grease drying out/dissapearing too quickly on the rear. But im also in a debate of getting 18s....will 225 tyre stretch too much on 8.5j? And a b6 bilstein shocks kit. Thanks in advance and i look forward to discussing what more/what else i can do to this beauty....althpugh i do need to get exterior sorted if im not taking o4 vrs.