I have the 1.4MA in Australia too, and I find the ride to be pretty firm. Living in Hobart especially with sketchy old roads, I wouldn't go firmer and i wouldn't go to 18 inch wheels either from the 17s on it.
Maybe your suspension is just a bit tired? I bought mine brand new... These are the OEM factory shocks - Alfa fit Sachs from the factory and by 80-120K Kms theyre pretty much done, and by 50K kms i reckon you'd notice a difference refreshing them. 315 740 - Shock Absorber
But, I have some Eibach Pro Kit lowering springs on my Renault Megane which lowered it a modest amount but kept it riding decently. I dont know many places in Australia with good enough roads to warrant going for much firmer than the stock G suspension!
Maybe your suspension is just a bit tired? I bought mine brand new... These are the OEM factory shocks - Alfa fit Sachs from the factory and by 80-120K Kms theyre pretty much done, and by 50K kms i reckon you'd notice a difference refreshing them. 315 740 - Shock Absorber
But, I have some Eibach Pro Kit lowering springs on my Renault Megane which lowered it a modest amount but kept it riding decently. I dont know many places in Australia with good enough roads to warrant going for much firmer than the stock G suspension!