My fan roars while revving at startup. However, I am not hearing it roar or seeing a change in speed once the van is at normal operating temperature driving around town, immediately stopping and lifting the lid to rev again. New fan clutch in my future?

My engine recently got hot driving up some grades in 95F heat so I have been trying to work on the cooling system. I have replaced the radiator cap and plan on putting in a new Toyota thermostat with AISIN gasket. I also ordered this electric pusher fan: Spal 30101505 12" Straight Blade Low Profile Fan. I think at first I may just wire in a relay and switch directly to the battery so I can turn the pusher fan on and off from the dash for those more extreme situations. I can also use it to cool the engine bay down a little after turning the engine off. Researching the thermostat fan controllers online it seems like they are pretty hit or miss. They either fail often or people have issues getting them to activate the fan at the right temperatures. The flexalite one that seems the most reliable is over $100 and making my cooling system more robust is already going to be a multiple hundreds of dollars ordeal. Not sure if I should dig into replacing the water pump quite yet. Not quite ready to have the van down while waiting for my radiator to be recored or figuring out using the Griffin Aluminum one VanCo used. I am sure it needs it all though.