Offset is +45, as denoted by ET45. Compared to your stock VTI-L wheels and tyres, which are 16x6.5 ET55 and 205/55 R16, your 18" rims and tyres are sticking out 20mm further than stock, which could be causing the rubbing. You need 18x7.5 ET55 rims or get narrower tyres (215/40 R18).