In our research garden we had excellent results with a variety called 'Velour', last winter. I have no idea where you can obtain them. Check with any large greenhouse, they may have varieties they like even better. His next cruise will be from Rio to Chile on February 4th of 2000. Call the above number and they will send you the information.
Jade plants like to be root bound.
If the roots are coming out the drainage hole in the bottom of the pot, repot into a pot only one size larger. Feed sparingly, once or twice a year only. You probably have that figured out, as it sounds like the plant is doing just fine. Use a regular potting soil for transplanting.