You will get used to it mate,its a doddle.Set up and spraying takes us about 15/20 mins now.I just use standard r+s cant be doing with them clamps.
You need to spray rend aid nice and wet i'd use a 12mm nozzle, i find it a lot easier to pump test if you turn the speed down a bit.
When im ready to put powder in i just pit enough in to fill the mixing zone and then run the machine for a second or 2 just so you see material come out the bottom, then i stop machine them add more material and away it goes
ive always set ours to 15 bar. 1 bar for evey meter of hose.
is that to high?
When you say mixing zone do you mean the black rubber bit?