Well - that's a unique and interesting problem!
I don't think letting air out of your tires is going to help. And nothing you do is going to help with your vertical position on the trike - you're going to have to lean to the left to counteract the effect of the crown of the road.
But you could sort of maybe put your heaviest loads on the left side of your basket (maybe even hang something on the outside) to help with the handling some. And look for more horizontal surfaces.
