Hey @bthiel,
I have had pairs of both the Vaypor S and Vaypor 23. The Vaypor 23 allow around 5mm more rearward cleat positioning than the Vaypor S. This is for me, in a size 46.5, regular width. I’d love to get even more rearward adjustment to be honest.
With the slotted design on the Vaypor 23, you can use the mid foot cycling cleat adapter Adapter for Shimano SPD-SL, Look, Garmin and Time – Mid-Foot Cycling. This won’t work with the non-slotted design on other Bont shoes without modification of the adapter. If you want more info on that, definitely send Niels an email at Mid-Foot. He’s incredibly helpful.
Perhaps the cleat positioning is different between the Vaypor models generally and the Riot models? It’s worth an email to their customer support - I’ve found them responsive in the past.