I'm 85kg without gear and ride the Dragonfly V1 7' 19" 100L

Using a high aspect foil and longer mast will help dampen the roll side to side.
The main technique to better control the board is have 70% of my weight on my back foot. Drive with back foot and also bend over a little to keep your weight lower. Also try and stay pointed into the chop until ready to attempt take off. Over time your balance will get better as you learn to bounce around with the board and use the Parawing to keep balance. You can pivot the board pretty quickly off your back foot, think having the board at a 15% nose up angle. This will also help take off faster as you power up the Parawing and transition your weight forward and will create more pop.

I felt the same on my DFly Surf 112 learning parawing. 93kg. You adapt over time to the long, narrow, high volume shape but a smaller, parawing optimized shape follows the pull of the para much better and eliminates the tracky feel. I'm on the Arc 78L and it feels so much more stable than my DFly!