19 August 2019
Assuming that you are having problems only on the run, as posted;
Here are a few suggestions;
Calibrate (mark) the centreboard at the rudder depth position, this is typically where I have the plate when I am running dead downwind; if you get a bit of wobble pull the plate down a little more.
Calibrate the kicker; mark a medium wind running position, where the top batten is not hooked and is just flicking, this is a good "typical" running setting, if it is windy or the boat starts to wobble, pull a little more kicker on.
If anything, sail slightly by the lee in the puffs, rather than head up, this should enable you to sit on the inside edge of the tank with a slight heel to windward, in "equilibrium", this also gives you a light helm. Keep an eye for the puffs coming from behind and anticipate.
Sheeting 2:1 off the boom can be quite effective if you are strong enough and allows you to make big rig angle adjustments, though things can go awry if you let off too much at the wrong moment!
Make sure that the rudder blade is fully down. Use strong steady movements on the helm; assert control of the boat, not the other way around.
What really doesn't work imo is sailing down the run perched in the middle of the boat, perched on the "coffee table"!
Hope that this helps.