3 year SUP'er getting into foiling and wanting to windsurf too. Inland lake in midwestern US (Indiana) with light winds mostly. Have a wind wing and just purchased a Neil Pryde Glide foil.
Most of the 4 in 1 boards are wave designed first it seems. One exception being the Slingshot Flyer 280 (at 11'6" and 280l) which seems to be the BEST to learn on but then quickly passed by for smaller, shorter boards once you learn to foil. We are at the lake every weekend in the short summer and we also have an elevated reservoir 20 minutes from me that gets more wind being 40' up. So I'll be able to devote enough time to learning over the summer.
I'd rather a steeper learning curve rather than outgrowing a "Learner" board in short order.
I have a RedPaddleCo 13'2" isup now and just sold two Bodyglove cheapies that we first learned on. Want some real rails, feet in the water and ability to turn the board. The RPC being 300L I hesitate to get another board with such high flotation and similar length. (280 is 7" thick!)
I am 90k so not sure that the 120ishL of most 4 in 1's (Fanatic Stubby Foil, F-One Pampanoo, Starboard Hypernut 4 in 1) is enough for me given the light wind (dying to no wind) nature and uphauling a windsurf rig. ??
Ideally I'd like a 150L or so I think, but that just doesn't seem to be out there in a 4 in 1.
I"ve read foreign accounts of a larger Pampanoo this year - 8' and 140ish L but I can't find any information on it in the US.

In another discussion it was mentioned the bottom design of this very pretty SIC Marlin (new model) would not be good on waves, and I'm wondering if that means (by default) that it might be better in flatwater situations. (it has a center channel down the board, in part to keep the foil mount at 90 degrees) ???????????
Thanks for any educated input.