pump sizing for drip system

Anybody have any idea what size pump i would need for a 24 plant drip system?

I have a feeling these drip rings arent going to work so i bought stream bubblers in case

1/2" line with 3ft rise out of the resevoir
10' of line towards a 1/2" tee that feeds either table. Each side is identical so i will just describe one.

About 2 ft off the pump there is a small dripper punctured in to prevent siphon

From the pump feed line there is a ter that goes 4" to a shut off valve. Then another 6" to a tee that feeds a 5 ft circle of drip lines punctured into it with barbed elbows.

My current pump is a 396 gph but its just jot cutting it, there is barely any flow even if i shut off one side completely

I don't have a problem using it with 12 sites (haven't tried any more)
Perhaps you are losing pressure at the anti-siphon return? or a rouge piece of peril lite in the pump inlet.

Its dtw we just set up the lines yesterday, for sure the inside is clean. Only ran it once before figuring out pressure wasnt sufficient. I tried pulling out the anti siphon line and plugging it and still dont get pressure