This really is a good read. As far as I know, I was the first person to receive a Simmer Freegal board and still have the semi-custom Freegal 100 proto. I think that it went into production unaltered, even if the most recent version most likely have received a few tweaks.
It is, of course, designed by Ola Helenius, but I like to think that I had a little bit of influence in the origins of this board. At the time in 2013, I jumped back and forth between my FlyWave 85 and a Fanatic Skate 100. I had also sailed the Quantum 85. Somehow, I got the impression that maybe parts of the Skate 100 design could successfully be mixed with the Frugal 88 - introducing a faster rocker and slightly different rails into the compact Frugal outline to potentially create a very manoeuvrable big wave board in lighter winds. I was mainly looking for a board that would get going easily with not much power in the sail and a bit of push from the waves and give better mobility in the break in not-so-perfect conditions. It was of course also influenced by having seen similar 100-litreish compact shapes from other shapers, mainly custom though. Not least the Mark Stone and OES (Peter Ross?) designs. I had a (long...) mail chat with Ola about my idea and, to my delight, got the board delivered a few months later.

To now read about this shape, albeit in the 110 version, being used in Gerroa south of Sydney (where I lived for a bit less than 6 months a long time ago) makes me smile a bit in front of my screen.
Anyways, I have used my Freegal 100 in all kind of conditions an fin set-ups. Everything from flat water with a single fin, which actually works surprisingly well, to twin, tri and quad fins up to head high+ waves. In waves, I did find myself preferring it as a twin, since it gives the best mix of speed and turning ability in my book. I think that it also benefits from the twin set-up, since I mainly use it in light wind wave sailing where the boards ability to quickly adapt and get into turns is much appreciated. Funnily enough, the twin fins that I have liked the most are 17 Makani fins (Walu 2, though) with a 5.3 BlackTip sail.
However, I am still to find a good tri-fin set-up to work with this board, but I think that it should be a very good option as well. I have a couple of new tri-fin setups that I will give a go later this year. Overall, the Freegal is a bit different to sail than a more traditional wave-shape, but it certainly does offer really good turning for its size. I think that its main strength lies in keeping speed up even in very tight turns. If there is one thing that it does not like, then it is if you try to put (a lot) of pressure on the rail for longer, faster turns. You also need to distribute your weight and cannot push firmly with your back foot against the fin(s). In short, it is not a board for the back-foot heavy guys. For nice, flowing turns in lighter winds with good ability to adapt to the wave, it still is a board that still manages to surprise me considering its size. But, I am of course biased when it comes to this particular design...
It would be nice to read if you've had any more learnings about your Freegal 110 and how you set it up.