Unfortunately with the 1.4 multiair 200bhp is max anymore is a push and just luck of the bunch. If your looking for the edge would consider my methods and lighten the structure, trofeo race cars use a carbon compound on bonnet/boot/roof however these are exspensive and roof is a structure part and cage would need fitting, remove the rear wheel well pointless on the punto no spare, and inflation kit is small, the wheel well is heavy and can be replaced by, carbon sheeting plus some strength ting rods.
For more power I've got a few tricks up my sleeve in the next few months. But look into polybushing the rear engine mount cheap and effective on the punto