It's so cool that you have one of these! I've never cared much about the flush, but I've always preferred the shape of the Glenco over the Afwall. It flushes well with that valve, just a bit short though. I've seen a NOS Afwall from 1985 and it had 2 siphon jets. The only one I've heard of with 1 jet was a 1978 back spud Afwall, which I believe now belongs to Capturing Toilets.
It’s quite sad that American Standard doesn’t make these anymore but it’s still an incredible toilet pretty cool flush too I’m between a swirly and straight down flush too satisfying siphon as well
