Hi Zoberman, I do not consider myself to be an expert in this area but I would say
I think a spring difference from 3.4 to 2.2 is just plain wrong. It is imbalanced between front and rear and hiding another problem.
I am building my 1st T3 car , a '12, and I was surprised, in the kit settings, that when XRAY moved the front springs from 2.8 to 3.0 that they did not move the oil at the front from 350 to 400. The two settings are not linked in absolute terms but there is a general rule for balance of overall settings that one tends to stiffen the oil when stiffening the springs. To avoid any arguments I am saying this is a general tendency and with any given circumstances, fine tuning may not follow it.
But to me stiffening the springs from 3.0 to 3.4 without touching the oil is wrong.
I would be inclined to put the 3.0 springs back on with 400 oil and maybe move the upper connection out one hole. If you still have a wayward rear end I would be inclined then to look elsewhere rather than piling on the front suspension stiffness; balance is achieved via mutiple things including symmetry. HTH
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