Help Me Cool Down

hey friends been getting a little hot lately with warm temps and I need to optimize my cooling system. I have a unique system and need help finding some parts. Build is a turbo 318 magnum w/ 904 in a duster running e85.

It will stay cool under boost but if it comes to a sudden stop and idles, temps climb.

Problems with design:

I’ve had to run a underdrive crank pulley and that lowers my fan speed. I need to find or CNC an underdriven water pump pulley. Water pump is an upgraded unit - more impellers.

My fan position is questionable as to efficiency inside my shroud. What depth should it be to the radiator and the exit of the shroud?

My radiator is smaller than expected and the shroud is custom - how can keep it and make it work? Add a reservoir? Remove the oil cooler up front and mount that cooler elsewhere with an aux fan? Repurpose the radiators trans cooler into something?

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Get rid of the flex fan ! Those are only good for stock lower h.p. engines . How thick is the shroud ? A thin one will cut air flow ! Use the biggest mech fan u can run . Small Pulley is a problem too.