They'll come naturally, I can assure you. You may even surprise yourself with new combinations never before thought possible.
You'll get cavitation when you don't have a loop full of liquid i.e. a bubble hits the pump. In my case I use my pump to HERMS/RIMS & after I start the mash I never allow the pump to get empty.
This is a really old pic, but the pump is still set up the same way. The top 2 valves (V1 on the left, V2 on the right) are going into the pump, V1 from the MLT, V2 from the BK. On the bottom V3 goes through the RIMS tube up to the autosparge. V4 on the right goes back to the BK.

I dough in with everything closed. I open the MLT valve & V1. Gravity will start to fill the pump head at that point. At first I used to open V3 at the same time so air could escape in the other direction as well, but I still ran into cavitation issues from time to time. Now instead of opening V3 I don't have a hose hooked up to V4 until the mash is under way, so I use it as a bleeder valve - open the MLT & V1 full, put a pint glass under V4 & slowly open it about half way. After 2 or 3 pints I'm convinced the pump head all the way back to the MLT is bubble-free. Now the important part is to start the pump BEFORE opening V3. Otherwise air trapped in the RIMS tube will come back at the pump. Opening V3 slowly eliminates that problem.
With your setup you have a couple of options. One is to bleed the output as you're filling the kettle. Another would be to add a 2nd valve on the output & use a procedure similar to mine.
Lee
"Show me on this doll where the internet hurt you."
"Every zoo is a petting zoo if you man the fuck up."

BN Army // 13th Mountain Division
