Pal,
I understand the 'physics' of suspension better than you & for longer than you have. There are some things that are just FACT. One of them is that a tyre with a very short sidewall is going to give a rougher ride because the AIR is what cushions the road shock & there is less air to cushion the shock. If you think better shocks/spring rate improves the 17" wheel ride, then those components used with a 14" wheel will also make THAT ride smoother/less harsh.