Michelin TB15 215/55/15's have a nice big compliant side wall which shouldn't cause any issues. At the temperatures you are running on the road then I doubt the tyres can really be classed as sticky. Guy runs a wider squarer front tyre which should yield more issues than yours.
Have you actually taken the time to remove the damper & check the bump steer? You have mentioned a number of times that you have altered the front castor. Are you aware that each time you alter the castor you should then double check the bump steer as castor adjustment alters the relationship between the steering arm & the steering rack which in turn provokes bump steer. About 4 pages ago we covered the subject of twitchyness & the subject of bump steer was raised. If you are now happy with your ride height, toe settings & tyre pressures then can I suggest you actually check the bump steer before buying new tyres to replace the ones that plenty of others here run with out issue.
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