The wear pattern was on the inside of both tires but was not consistent all the way around. Lots of cupping and several areas where the tread was noticeably thinner than other areas. Ran them at 17PSI. Had them remounted and rotated at 38,000 miles.
While you're right about them being over engineered for our Spyders, if those last set of front tires that wore like that ^ were Vredesteins or any other reasonable quality 'non-OEM Kenda/clone tires', then I'd suggest that maybe you should now be looking/checking for something wrong other than '
just' the wheel alignment?!
Not consistent wear with lots of cupping and several areas around the tread with noticeably thinner tread than other areas
generally would suggest that something is wrong/worn in the suspension itself, the steering, &/or tie rod ends...

Look for worn ball joints or tie rod ends maybe; or possibly worn 'A' arm mounts on the inboard end of each wishbone; or it could even be due to worn/damaged shocks &/or coils; maybe even other suspension &/or steering components that are worn &/or damaged too?! And if they
were rotated & remounted almost 10K miles ago and yet the tread wear isn't bad on
both the inner and outer edges of the tire (that sort of milage is plenty to have scrubbed the 'other' edge that'd now be on the inside of each tire with a 0.75" wheel misalignment, leaving both inner & outer edges worn badly), I'd suggest that it just adds to the concern that there's something else wrong!?!
I'd think that if it was
JUST that much out in the wheel alignment, then reasonable quality tires should've been scrubbed fairly savagely but likely pretty evenly all the way around on both sides - the lack of consistency suggests there's something else adding some unevenness to the nature of the wear that needs to be found and rectified ASAP.
Just Sayin'
