Hey Victoria!
Gonna' be in Melbourne on Friday and Saturday, going to try and convince Birds and Artz to have a beer or 13 with me, anyone else keen would be welcome too. Staying in (I think) Albert Park.
Mind you if OP was worried about what is sensible he wouldn't be trying to fit 10" wide wheels on the front of his car - haha!
But if he wants to keep the tyre size "safe" and "legal" in relation to his wheels then he would have to run a 255/35R18 tyre on the front however I fear this may lead to both the rubbing and the scrubbing.
Duncan, only 0.5" narrower
A 235/40R18 is actually a legal tyre size to run on an 18x9.5" wheel here in Australia. By my calculations the 18x10 +15 will stick out only an extra ~5mm than Alex's 18x9.5 +13.
Edit: however if Alex was running a 225 tyre then (in theory) that should give him an extra ~5mm of tyre clearance and then the wheel clearance. Enough to reduce rubbing.
Either way 18x10 is too big for the front of a 33 GTS-T.
Get rid of the comically oversized tyres and put some 235/40R18s on there, roll the guards, upper camber arms at full neg camber and all the very best!