It depends on what you’re specifically trying to do.
With the OTK chassis, you typically go to a harder axle once the track tightens up to free the kart up. But a lot of factors come into play.
Is the kart the lifting the inside rear on turn-in?
My suggestion would be to narrow the rear track up a bit and see if that helps. If so, you need quicker lifter action. Also try tightening the 3rd axle bearing. If that helps you then know you need to go stiffer.
My gut thought is on a 32mm chassis in LO206, you’re not going to want the kart super stiff because you simply don’t have any power to flex the kart, but who knows.