I think there was only one Psycho 4 4m proto ... and I have it
I used exclusively psycho 4 for many years strapless riding in waves. I had 4/6/8 and 10 DL and I used to travel with only 6 and 10 DL to keep it light (Brazil, Australia, US, Mauritius, Europe, ...). I really loved these kites for wave riding. They worked very well in waves and handle strong winds quite efficiently (and for solo launching and landing where I traveled, they were quite good). Here are a few examples below (I was lucky enough to be able to work in nice locations along these years!):
One-eye, Mauritius, 2008:
Ocean beach, SF, 2009:
Chaplin beach, Cape Cod, 2010:
Yallingup, WA, 2011
Horrock, WA, 2011
Galicia, Spain, 2012
They convinced me that foils in waves are a real option provided that they are properly designed for it (and not some beginner kite that "works" in waves) and I was sad when I understood that FS were going to abandon this route.
This said, nowadays, no foil beats this for strapless riding in waves (Photos are from Punta del Diablo, Uruguay, on two different days):
The CA Waves are a huge step up with respect to the psycho 4! So if you are not too addicted to FS (which I understand given the involvement of Armin and the quality of their kites), I would recommend you to drop a line to Benoît and get a 4.5 or a 6.5 or a 8.5 (with a good lift front wing on your foil). You will understand why I am saying this (this is a several years design. The first protos were done in 2012 but Benoît has been playing around with this design for more than 20 years now ... a bit like Armin with his speeds and HR followers at FS). I am pretty sure that they could change the way you ride in waves, in particular if you are into hydrofoiling. I have been travelling with a 4.5/8.5 combo in Argentina/Uruguay this year and they replace my now old psycho 4 6/10DL combo that I still have in my garage for friends.
Psycho 4 are dead, Long live the CA waves!
PS: the board is also very very important. I don't ride typical "kitesurfing" freestyle/strapless boards.