those bloom and hdr settings look a bit too much for tf2's style, imo. There seem to be lots of high-contrast areas not created by textures but from light intensity: the white wall by the lighthouse, for example. Reducing the bloom may help with alleviating the apparent contrast, but some of the indoor/darker areas may still require some extra lighting. And/or don't use white textures for brushes exposed to direct sunlight, but that will make shadowed and dim areas even darker.
yeah, thundermountain uses darker textures a lot: i'll start playing with settings.