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Did the foam on top of the radiator make it back in place after the upgrades? Sounds like you might have a lot of air going around the radiator rather than through it. Also keep in mind the air into your radiator is already very hot from passing through three coolers first (intercooler, oil coolers, and AC condenser). At the very minimum make sure the OEM foam is around all sides of the radiator forcing air through it rather than going around it. Better yet would be to add ducting from ACE or make some of your own.
Past that your options are to increase cooling capacity with a bigger radiator, reduce air temp to radiator by moving the oil coolers, or increase air flow through what you have with hood vents.
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