HI, new to the forum with some questions.
I now have 3 parafoil kites. The oldest is a Premier Kites Parafoli-5. (30" x 19", 4 cell, ~11 foot tail) I've had it for years and it has always been a great flyer. Hold it up and it just goes, stable, no problem up all day tethered to a sand anchor. Even with a spinner down line.
I recently purchased another Premier Kites 20" x 12", 4 cell, 12 foot tail. So far it has been disappointing. Not very stable at all, needs constant coaxing to go up and stay up. Seems to spin around almost constantly.
The bridle angle seems pretty close to the same on both. I did try some extra tail and it seemed to settle down somewhat.
I can easily make a longer tail, or even more strands in the tail, but is there some thing else I can tinker with?