not to start any bickering, i have no experience on it and it sounds like the setup has worked well. this is just regurgitated food for thought: i remember hearing something a while back that seemed to make sense... People spend a lot of money for "high flow" cooling system components and don't always achieve great results. I can remember reading somewhere (gojeep maybe?) that actually putting a restrictor in the upper radiator hose will increase cooling capabilities. the reasoning is that with all the high flow jingles, the coolant moves through the radiator so fast that it doesn't have time to cool off sufficiently. putting in an inline restrictor (i think it was a doughnut shaped piece of cutting board to be exact) would slow the coolant down and actually keep it in the radiator longer, giving it more time to dissipate heat. giving the coolant more time in the block supposedly has the same effect.
again, i don't have much personal knowledge on this, just figured i'd throw it out there as something to think about...