Very interesting to hear your experience of the Avons. I follow minority motor sporting events with Speed Hillclimbs being a major interest. Avon racing tyres are a popular choice with many of the "serious" competitors and I've been meaning to try a set of their road tyres for some time now. So, the other day, when I had a puncture on a well worn tyre on my Ibiza, I decided to try the ZT7. When I contacted the chap I use for tyres he said he'd be pleased to supply but he wouldn't particularly recommend them as he'd noticed a few which he'd changed recently had problems with cracking at the base of the tread grooves. In fact this cracking problem is present on all 4 of the 5+ year old (original equipment) Bridgestones at present on the car and is exactly why I'm thinking of renewing them all (They have about 3.5mm still on them after doing nearly 25,000 miles and the rubber is now "hard" and doesn't grip so well in the wet).
I tend not to buy "premium" branded tyres but do go for a good "mid range" product. So, after a lot of reading of reviews - car running around on it's full size spare - and asking friends at local independent tyre suppliers, I decided to go with Falkens. Sincera SN 110 to be exact.
https://www.falkentyre.com/en/tyres/car-tyres/product-detail/169291 Their publicity stuff seems to particularly claim good wet grip and this seems to be supported by several independent comparison review videos I've watched on you tube which also praised their overall performance. I'm impressed also that they supply tyres to the "drifting" community and "drifting", not a sport which particularly interests me, "punishes" tyres something rotten! If they survive that I think they'll survive anything I might do to them. I suppose that if they are slanted towards providing good wet grip it might imply that their tread rubber is somewhat on the soft side so expecting them to last for ultra high mileages may not be realistic? However that'll suit me fine as I no longer do high annual mileage so tyres "dying" due to old age and rubber degradation is much more likely than that I'll ever actually wear them out. It'll be interesting to see how they do.