Only thing I can think is you’d definitely want a low micron filter before hand as that coil was never meant to have that much liquid flowing thru it. It’s a coil made for refrigeration it’s supposed to have gas pushed thru it now water so it could definitely clog up quite quickly
Also as others have stated more airflow will help quite a bit. You are also doing the right thing running the water a slow as possible it gives it good time to absorb the heat. I would say with increased air pressure you could bring your water delta to quite a bit higher even with the warmer water you are having to use
Mate, you're throwing money down the drain. The coil needs to be cooler if it's ever going to remove humidity. You are better off using that electricity on something more efficient. there are 12,000 btu (1 ton) units that are surprisingly good, they use a dual hose and rotary compressor. Also no condensate because they use it to cool the condenser.
