Screwed up my lawn irrigation, possible solutions?

I had an irrigation well pump installed and it runs about 50 psi but has a pressure cut off at 60 psi. I stupidly ran 2 lines with 3/4 pipe and about 30% of the time before my heads are all up the pump hits 60 psi and cuts off. It does this over and over every other second or so, sometimes my heads will start to working other times it continues indefinitely. Once running, it works great. My solution is to open my hose bibb valve and reduce the pressure until the heads are up. Obviously this doesn't work when its set to run automatically.

Basically I think the pressure through the 3/4 pipe is too much until the heads are fully flowing with water. I'm only doing 16-18 gpm so 3/4 should be plenty to support that? If I go over 20 GPM then my pressure drops substantially to where my heads don't work right.

So I need some sort of pressure relief. The obvious answer is install another head closer to the pump. But I don't want to do that on multiple lines that run the same direction really. I'm thinking of putting in a length of 3 or 4" pipe right next to my well to suck up some pressure? My other thought is some sort of pressure relief valve on my hose bibb next to the pump? Any other suggestions to reduce the pressure in my lines temporarily?