So Avon cruiser tyres... You say they aren't that great for hooning around a racetrack at the absolute limit?
Guess why - They're road tyres, designed for road use, on a Cruiser doing pretty Cruisey things (ie below 90mph most of the time).
My last set of Avons lasted me 19,000 miles before the bike itself karked it and they were still good enough to pass on to someone else thereafter. I'd say 24k out of a set is considered a paltry value, even if you are a loony on your Cruiser. These things are meant to last and maintain good grip in all weathers on all roads, but are definitely not racing tyres!!