Mild you say, so swing weight, balance, or center of gravity should not be affected too much?
Nose, mostly out of the water when you turn, but trimmed can give lift, paddling gives lift so you can paddle from forwards maybe catching waves early. Won’t talk about stringer less weight, first sentence.
Mid, should help wave catching and initial response when starting to plane, but really clear of water when turned hard off the tail. Might cause some bounce action in bumpy, tide, and backwashed waves, but quicker feel might offset this and the board should be able to be turned from slightly forwards.
Tail, don’t see it very often, as it limits your banking ability and loosenss when moving fast. Most effect, as tail is always in the water, can bog on hard turns, bog when turned hard, but feels fast with light pressure surfing. Suspect if might be like hard rails on a fast wall, rides high with hold until it suddenly releases. Might be great for slow moving waves, horrid for fast moving.
We made a few boards with full single concaves, but they seemed very limited as to what waves it works in, how much pressure to turn, and converse affect after it turns…like it slows waaay down, then speeds waay up, causing no gain.
Of course, much more testing needs to be done before any real conclusions.
Just our 4 single concave thru tail boards.