This is easy. Antifreeze sucks the donkeys nutz for heat transfer. Use alcohol (ethanol in this case, you have no need for methanol at those temps, I don't think) and Water Wetter to drop your temps dramatically. That is why you need to use less antifreeze in your car in the summer ... it doesn't transfer heat anywhere near as good as water. Get rid of the antifreeze and get yourself some better coolant.
Also, check that your block is lapped good, that you're not using too much goop (minimum is best) and that it is seated square. Also, I hear that that Swiftech isn't the best for cooling ... I could be wrong on that, but the interior geometry of the block doesn't look that promising.
Overall, your coolant might be what is hurting you. If the fluid can't absorb the heat from the core, the core won't cool as much, right?
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