[wilf leek]

Hiya guys. I can't really offer any tips on additional cooling over and above what has already been said many times on this forum, however, so far I see one thing missing - guage accuracy.

Car guages are not accurate, calibrated devices, unless you go to some race oriented types.
My first move, faced with a car that worried me because of the guage reading, would be to double check it against a good, accurate, electronic thermocouple type instrument.
The reading you get on a mechanical Smiths type temp guage is only relative - you can't count on it for absolute temperature readings.
If your car is not puking steam and water at 220 degrees on the guage, you may not have a problem. It is only natural for temps to rise as ambient temperature goes up, or road speed and hence radiator airflow, goes down.

Double check your guage reading against an accurate instrument - I did, found my guage was actually under-reading by 10 degrees (centigrade). Made me reset my fan cut in temp pronto.
HTH