"Squirly" would not have been my first choice of word. With the seat in the factory position I found the boat stern heavy & got back looped a few times, difficult to boof and slow to turn. I moved the seat forward in order to get a neutral trim while I'm in a normal paddling position. I found that with the seat in the factory position, shifting my weight forward made litle or no differance. With the seat moved forward about an inch has made a world of difference. I find it much easier to boof & turn and with the stern out of the water more much easier to keep on line.
I chopped LOADS of the seat off, everything from the clip in loops back. I have a peli 1400 for my camera and it is the only way I could get it in. It's still a chore to get in and out.
I've trimmed the rear central pillar to make room for the peli case, first aid kit, etc. Put padding under the seat as Dagger had not put enough in. Put some foam on the seat to raise my centre of gravity and put a good chunk of closed cell foam on the bulk head to provide some cushioning.
You think I should try moving the seat forward just for the sake it might paddle better?
Impossible for me to say. If it aint broke, don't fix it.
I'm 5'10", 65Kgs & size 9 dogs, if that is of any help to you.