I would think that Anything that’ll move 120 gph should be plenty for the HP range you’re in. First thing I’d do is go to a 1/2” pickup. It’s a “weakest link” deal. I got one off ebay, worked great for me, although I’ve since gone to a cell.

More food for thought: a couple of years ago, I was running 1/2” hardline. All was well until one day when it wasn’t. I couldn’t figure it out.... eventually went to -8 braided line. Problem solved. Never did figure out WHY, but I haven’t had a problem since. I pressure tested the hardline I pulled, tested fine (????). I run a Carter 4600HP electric leading to a 4862 mechanical. Seems to be working for me, I see 5+ psi out the back door.