What does "overheat" mean? Your car may not have done that in the past, but a little past middle is normal especially as the car ages. Do you know what the actual temp you're reaching is?
I would also try doing distilled water and Water Wetter. A lot of people including me have have success seeing lower temps.
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[Track] 03 AW/CIN 6MT E46 M3
[Street] 08 AW/FR 6MT E92 M3
[Tow/Overland] 23 Toyota Tundra HV TRD Off-Road
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