David - your format is 135. For many years it was too for me and I always worked on to how to obtain sharpness untill I had read enough books explaining what is sharpness! Constraints of film size and lens resolution set a limit to the sharpness - law of nature! I made decent enlargements 12 x 16, but was'nt convinced. Then I got a Mamiya 7, and immediately understood what a sharp print is!
So your choice is IMHO : EITHER use a tripod (or not) and accept what 135 format can do (which can be incredibly good, just look at works of great photograpers, e.g. Cartier-Bresson); OR get yourself an MF camera (when I came to that point my greatest issue was I had to get a new enlarger!)
Good luck, Peter