I've never used the A/R Hoosiers, just trying to find a similar or better tire for R13 application. Curious on what sizes did you try the A7, because from my understanding, the A7 never came out in our sizes for 13, only R7 was available in 185/205.
My ZZR 333 are almost done, maybe 2 trackdays left, but last week I blew my diff on track, so it will probably be a while until I'm out on track again. Sourcing Sierra Diff parts in this side of the pond is quite tricky.