I think I've strayed away from too much squish because all I've ever gotten is curling back up onto the nozzle. And, this has happened with two brands of PETG now, black and transparent. I've swapped out nozzles a number of times. The layer thickness and some unique bed prep has helped adhesion finally.
I tried a print with no mods based on what you sent. I got zero bed adhesion. Admittedly, I should probably do more with the bed, I do clean it and I've tried hairspray - seemed to make no difference. What I settled on is this - clear packing tape, stuck to the bed, and then I let it heat up. I peel it off before the printing starts. What i've seen is that is does a good job pulling of any debri left behind, and it leaves a super thin layer of tack-ness (I think?) and that's been how I've been able to finally get some bed adhesion.
With your settings, based on my experience, the speed was too fast for me, the temp too low. Going to give it another go with a slower speed higher hot end, and higher bed temp.
btw, that fin is cool! and the quality looks great. that's how my prints look in my dreams, lol.