I used to run 1 100psi pump, 2 same reels and same hoses and same pencil jets.And no probs at all. I'm still using the same pump 4 years later.It's got to break now I've said that. :
The trouble is that as the demand for water varies on any one of the poles the pressure on the other pole goes up and down.Its like when you are having a shower upstairs and somebody downstairs turns on the hot tap.