Elkaine your coilovers should have adjustable top mounts.
Its your camber and tracking thats wrong, it needs setting up. I got mine done other day, makes a big difference.
When i first had my GT i had Toyo T1-S tyres, and it killed them in about 4k miles!
Then after it was T1R time (well after some kumho on the 16's) and they lasted longer, cant remember how long though. However on track they would marble a hell of a lot!
Fast forward to the coilovers, allignment and camber done, and there were hardly any marbles! Makes sooo much difference. My tyres hardly seem to be wearing at all compared to they used to, and i corner HARD virtually ebverywhere i go! lol.
E, the front n/s (front left) always takes the most abuse due to roundabouts
. I run 32psi in my 195/50R15 T1R. If i recall you have 195/50R15 toyo PX4 so these should last longer theh the T1R....
Might be worth checking yuo dont have any dodgy bushes too, and are the top mounts ok? Not worn out?