Hi again Diplomacy.

The rocker and valve geometry will always be wrong with a longer valve.

The post angle and valve angle are not parallel, so the higher you go the worse it gets!

I guess an offset shaft and a 'spacer' with an offset on top of the stand will help a great deal...

Whatever the extra length the valve is, the spacer will have to be the same.

Carpe diem, quam minimum credula postero, thanx Horace!

There’s no point trying to fix stuff that ain’t broke,,, 'but if ain’t broke',,, you is not trying hard enough...