Metzelers on rockets are not meant for sharp turns, its harder material rubber, Metzeler are pure cruising tire i.e. straight line tire meant to last way longer vs Avon.
Metzeler last longer than Avon for sure but dont push them in turns as you are probably used to with Avons.
last I checked they had 40+ avons in stock in USA, have you checked with main distributor in USA, Avon parent company?