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Always suspect operator error first. If the system was operating correctly before you cut the supply plumbing, thrn maybe you weren't so very tidy, and there is now dirt and debris to be cleaned out of valves and/or heads.
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To answer the question of whether a smaller-diameter section of pipe is ever used to reduce flow and/or pressure in a sprinkler system, the answer is "No."
i flushed out the line as best as i could to eliminate any debris - i doubt its debris that causing the rainbirds to stop functioning properly. I went on their website and they say that over pressure in the lines can cause the impact sprinkler head to not reset.
So you have your main water irrigation supply shut off, and then when you turn it on several of the zones turn on for a few seconds?
1st- turn the valve on slowly, never quickly
2nd- sounds to me like you have a leak in the main line or a weeping valve. Check your water meter leak detector