Could'nt agree with you more.
I bought a set of Yokohama's AVS DBS2 tires last year.
After 5 k miles & 2 re-balance jobs, the
inside and
outside row of treads was severely cupped.
Despite new shocks and very tight steering/suspension components.
NEVER, EVER Yokohama's again.
P.S. they are discontiniued now,..... would'nt you know it.