Same experience here. Swype was the original and somehow after all these years still the best?! Or maybe I'm misremembering because my standards were lower back then.

GBoard is noticeably better then Heliboard. I still use Heliboard but it is frustrating sometimes, to the point where I wonder if I should just start typing with my thumbs instead. Might be faster on the whole, since I sometimes lose 5-10 seconds correcting the swipos.

I will start submitting gesture data ASAP. The keyboard world needs this.