As always pH, great job!
WAJ UK,
You say your water temps are 2c worse as compared to the RBX. I take this to mean the water is 2c warmer, which would be a problem at the rad as you say.
Could you post the following regarding you rad set up: Rad's WxHxD, single or dual shrouds, fans diameter & thickness + cfm & pressure? Is the air flowing through the rad outside room temp air, or warmer case air? Many influences in good rad performance, and a large heater core should perform well if set up right.
From what you posted regarding water temps your problem may well be the fan(s) or how the fans are set up, not the heater core.
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