Irrigation system design and selection of Hunter sprinklers

Hi. I want to make a backyard irrigation system and I have a problem with the selection of hunter nozzles and a few general questions.

I have two sources of water: a main water connection with a capacity of 60l/min (I did the bucket test) and a rainwater tank with a pump with a capacity of 120l/min. I will change sources depending on the water level in the tank. In any case, the water main seems less efficient. the static pressure on the garden valve is 4 bars.

the water supply pipes are 32mm, but i have a 3/4 inch meter with a maximum capacity of 2.5 m3/h . the sections are close to the valve, the farthest one starts 15m from the valves and is 5*5m.

I plan to bury 32mm pipe and at each sprinkler give a T-piece and 3/4 inch flexible pipe. the difference in price between 25mm and 32mm is negligible so I will give the thicker one.

I have to divide the garden into sections due to the fact that the rectangles of grass that I can separate, do not always adhere to each other. I have several elements like raised beds, greenhouse and pergola that divide the lawn.

now questions:

1 - to calculate the pressure used in the data sheet https://www.hunterirrigation.com/en-metric/print/pdf/node/461006 I read that I need to change the static pressure to dynamic pressure, that is, 4 bar * 0.7 = 2.8 bar. supposedly you need to subtract 0.5 bar for losses due to connectors and pipe length. the pressure from the main valve may fall slightly in the summer. the pump from the tank will give a higher pressure, so I need to limit it to the lowest I can get from the main, to have an equal coverage of the sprinklers. it seems to me that I should use the PRS30 which have a limiter to 2.1 bar, because the PRS40 has a higher pressure that I can’t deliver in poor conditions. is this the correct?

2 - if I use the PRS30 with the mp1000 90' nozzle, I will have a maximum radius of about 3.7m? and I can only reduce the range by up to 25%, that is, to 2.775m? if I reduce the radius does not reduce the pressure below the minimum value in the chart and the sprinklers will still rise?

3 - how many sprinklers can I give per section? I can connect rectangles to reduce sections. Should I just rely on the water flow rate of 60l/min and not exceed it (or its percentage)?

4 - Do the PRS30 and PRS40 also have pressure adjustment, not just a limiter? I know there are versions without a limiter, but I can't find information about adjustment