That's a nice feedback.
Actually, I do not want to install spacer springs / packing, just want to play with tires and rims only, but within safe and permissible limits, and without jeopardizing suspension and fuel efficiency much. So, will do stick with 185/70, but with 14" or 15"? Well... I may go for 15"
If you are using 185/70/R14 with spacer springs, then I suppose, it would be better if I go for 185/70/R15 without spacer springs.