That sure doesn't look like a lot of flow. Tough to tell from a still picture. I would agree about asking the pulley diameters on the crank and water pump. Maybe even get that radiator flowed to assure it's working properly. Between water and air flow, SOMETHING is wrong. I would work on a better shroud that included all of the core, more fan and increase the water flow "somehow". It looks like you have a few things fighting against you.
