Interesting observations and I am not doubting you. The Nautique system seems to be a suck gate plus flow tabs built into one system as they seem to deploy at a 45 degree angle off that bottom corner of the boat. I have been in a couple of different G23s (2016 and 2018 year models) and I was very unimpressed by the wave in either model, from a surf point of view. Not sure if this is due to that combination or just a lack of added weight by the 2 owners.
'05 XLV with '11 hull