shureflo
I have a very similar setup, although I have a shurflo accumulator in line between the pump and the solenoid.
The shurflo pump has a fairly wide spread between the turn on and the turn off pressure on its internal pressure switch. I can't give you a firm number but I think it is about 20 psi or so. The pump also generates a peak pressure of about 150 psi during each pump stroke, so it is capable of making up pressure quite quickly.
I suspect what you are seeing is normal. On my system, I only hear the pump stroke a few strokes each time the system activates.
I have an indicator light that comes on when my boost switch closes and it is typically only on for a second or two at a time in each gear. With a 2 - 4 gallon per hour nozzle you flow very little water in the time it takes to go to over 100 mph. If the nozzle is a 4 gal/hr nozzle, and the WI is on for 6 seconds it would only move 1/600 of the nozzle hourly flow or about 1.5 cubic inches or about 25 cc.
Larry
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