Of those 2 choices I would pick the ak surf foil with 80cm mast.

The first gen fanatic foil was a bit of an odd design and it was not very well received. If you look at fanatics latest offering it is a totally different design and much more in line with what everyone else is doing.

The AK foil is a big wing for your weight at 1300cm, its design is quite similar to the naish thrust which I think is a decent wing but not the latest cutting edge design. You will have a lot of lift and be able to ride swells nicely but you might not have a great top speed and you might struggle to stop it breaching at higher speeds.

I am basing these opinions on my general foiling knowledge, I have not used either of the foils.

Personally I think 70-80cm is the ideal mast length for freeride/waves kite foiling on a bigger wing. Less than 70cm is definitely too short, many people prefer a 90cm mast or 1m its a personal preference thing.

Don't settle for a shorter mast. A dude with your skills will quickly get it and you will want a longer mast. I have not flown either of those wings so I can't comment. Enjoy the ride, I have a feeling you will be pretty stoked once you get over the 5 hours of ****, bangs and bruises. You will soon learn that upwinders are mighty fun, and heading back down chasing swell will get you pretty stoked.

Original Fanatic S1's fuselages (composite plastic) were not overly strong. It was pretty easy to have large front wing shear from fuselage.