My brother has a TF and says that the car is supposedly very sensitive to tyres. I find it hard to believe, but might be due to mid engined layout?
Also a rear drive car can be "tail happy". A previous 325 tds I had stepped out with me doing no more than 25MPH as I went over a wet drain cover. I got straight 5.9s from the onlookers as I contained the four wheel drift!
This was due to low tread and afterwards with new tyres was good as gold.
The recommended tyre was a Goodyear that is now out of production, so the best option now seems to be the Toyo.
Regarding the tyre choice for our cars, I have had Uniroyal RS3 and they are wearing as yours has. Someone will correct me if I am wrong, but I think all modern tyres are softer and wear more if they are quieter and better in the wet. If you go for a dodgier handling tyre it might last longer, but you will find the hedgerows are your friend!
If I read it correctly tyre manufacturers self certificate their tyres, just like VW did. We all know how that ended up.
I think you take tyre ratings with a pinch of salt and go for a reasonable brand at a a reasonable price.
I like to hope the more established brands than a "Chung Li" or "Rip more" will test their tyres more fairly and be a better comparison.