ben like you say your gonna get a lot more wall flex with higher profile
its just a fact of life (and physics) im afraid :???:
y did you go back too 16's????
reckon you should try a couple (2/3) more psi in the front and rear for a while see how you get on
its a hit n miss game with tyre pressures i think :shock: :shock:
let me know how you get on buddy