If you want to make a 'back beam slap' test, just come to Buenos Aires and sail-race in a South East 15-25 knots with short steep waves...

Original Capricorn could not perform to its full potential in these special local conditions due to a constant slap that induced a full stop and semi pitchs, that's why they modified the moulds and elevated the rear beam- Local made Capricorns are having a smooth ride with this mod.

Now we have Bundy's C2, owner report the easiest ride ever downwind on same conditions (he has two Infusion also to compare. I still didn´t sail it, but he is flying downwind)

Infusions are made for this river so no problem at all.

So to answer your question, the C2 has no problem with back beam slaping and was one the modifications addressed by Greg/Brett as the C2 rear beam is placed higher than the Cap-