I was gonna mention that, about the range they recommend.My current pump is rated for 370gph and after you said something I checked the specs on the chiller and they recommend 200-315gph, specifically their 291 gph pump. So that could definitely be the cause of my lower performance. I haven't ordered the new pump yet so I will look into the DC pumps you mention.
But yea, Jebao are decently priced, and can be had on amazon or aquarium/reef stores and the like.
Many brands, for example: https://www.amazon.com/s?k=jebao+dc+pump&ref=nb_sb_noss
Edit: I also specifically used them for rdwc style because they're dc, run very low power, and thus heat the water up less than a traditional style aquarium pump.