The Goodyear Eagle GSD3 are currently on offer at Camskill at £75.36 a corner in your size. I think these are what the Asymmetrics have replaced.
There's also Toyo Proxes T1R but only in 91W at £70.60, maybe worth a gamble would be the Hankook K110 V12 Evo at only £52.80 each in a 91Y, these have had brilliant writeups although I've never used them myself.
And again, Kumho Ecsta Sport KU31 at only £50.60 (W rated), Jus recommended these to me and I have top agree with him on how good they are, I have these on the back of my 156 and oversteer is not an issue in the wet unless I try really hard to provoke it. And this is with Vredestein Ultrac Sessantas on the front, known for how grippy they are in the wet. Unfortunately you can't get the Vreds in 215/45/17, only 225/45/17.
You really seem to rate the Dunlops, maybe you should stick with them if you are happy with them? I had Dunlop SP Sport 3000 on the front of my 156 when I bought it and I thought they were a bit naff tbh, but maybe the Sport Maxx are much better?
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