what???
you really got 2 coolers hooked up and a 30gal sump and haven't thought maybe something aint right here?
there should never be a reason to need to run 30 gallon water. or more than one proper cooler like that bernard. your cobbled together cooling is a direct result of running plain water. you've got corrosion, algae and clogging. 2 pumps and a tub of water is a big bandaid for a small problem.
you really need to use an additive or antifreeze if you want the best performance. or you will be getting corrosion inside the torch. the water jacket in the torch is tight... that corrosion will slow the water flow and lessen its ability for heat transfer. on top of the corrosion your water is also growing algae whether you can see it or not and that too is likely clogging your torch and lines. also your radiator is full of crap now
i would get new hoses and torch, take the top of your cooler and clean the pan really well and replace the strainer/ filter at the pump. remove and clean the radiator. after cleaning out the water cooler, with out the torch hooked up, i'd run a radiator flush/ cleaner through it. refill with (distilled preferably, i use the water that my dehumidifier collects) and put whatever the cheapest anti freeze you can find in it. and then you wont have to fuck with it for years.
worst case your pump needs rebuilt. iirc you should be seeing 40-60psi
with one properly working bernard hooked to the smallest c/k flex head, smaller hoses and all. 300amps at duty cyle.... i have ran for hours and never thought the torch was getting too hot.