The first thing you should do, depending on what types of subjects you are shooting is to buy a good tripod. No other piece of equipment will improve your photography like a tripod; it makes you slow down and look thru the viewfinder long.
Second, if you love those smooth, rich tones, move to a larger format camera. The bigger the neg, the better the photo.
Third, use the slowest film you can or want to.
Just my $.02