Hey Lou, and welcome.
I also have the High Capacity, and had the same problems. If you want to use your pump for both reflux and condenser, install a Y or T at a convenient point in the supply line, and then a valve to each of the above. That should give you excellent control over the head temp. Turning the pump on and off will destroy your reflux equilibrium every time. If your going to continue useing the tap for the condenser, then just instal a valve between the pump and reflux to control the volume.
Elricko posted several months ago, with this link he desighned:
http://tvbeer.com/cool1.htm The link was heating/cooling in Feb.
Several hints I have found very useful. Add 2 cups of boiling chips- rashig rings, broken unglazed pottery, broken safety glass, washed pea gravel etc. It moderates the boil from the kaboom and the large bubbles of gas, into many small ones. Also, insulate your column, thats critical, and the top half of your boiler will speed up your boil up times. I think you have to run the hot plate full power, or you will get on- off cycling, and that will also interupt the reflux, but you will already have solved that problem with water control.
I never do a single spirit run with the wash. I do 3 or 4 stripping runs, fill my boiler, and then do the spirit run. I use propane, and now a beer keg with a reducer, so I do double batches, which really helps with the cuts and the time factor. I can strip 50L in under 4 hours, and the spirit run in about 7 catching a gallon/hour at 95%. I also have cold spring water unlimited, so no water issues. The above times are light up to end of run. Get a digital thermometer with an alarm.
Those are some of the things that I learned the hard way, but have helped me.
I set the water flow so as to have total reflux for 10 min. or so, and take off the heads very slowly, then increase flow for the hearts, then shut off the reflux water for the tails and collect fast. Also, see some of the posts in the last several months about useing bakeing soda and canning salt for a stripped run.
Best of luck, and just ask away. There are some very knowledgeable and helpful People here.
Cheers!