Mike,
I've been using the cfr handtool for about 6 months now and pressure and jet size depends what your cleaning. I find on delicate upholstery materials use jet size red no 1 and the optimum pressure on about 200-250 psi.Heavier cloths ie draylon jet size green no2 same pressure. I tend to use bigger jet sizes for stairs and spotting, you can turn the pressure up to around 400 psi on the largest jet size no 4 blue.
I'm pretty sure this applies to all machines (TM/portable) although i can only advise on using the cfr handtool with my cfr machine.The most important thing to remember when cleaning upholstery with this tool is to lift the material off the foam whilst applying water.I tend to achieve drying time on a suite about 30 mins with the added use of an air mover.
One more use, if you take the handtool away from the jet you can then use the jet to help clean down your equipment after use.
joe