83urq Water Temp too High

[Glenn Lawton <lawtonglenn@gsmai.com>]

I was thinking.......

On the 83urq, the water temp acts normally (i.e. the thermostat opens
and closes) during normal driving, but after a 20minute rungroup
on track, it seems quite high (I think I remember 240F-250F).

At the end of last season I asked the list, and got several responses
that said, essentially "don't worry about it".

Well, now I am close to deciding to change the K26 to a water cooled
K24 turbo, and I say, hey wait a minute, that's going to add even
more heat load to the coolant.

What should I/ can I do to improve the cooling (remember the thermostat
is fully open, so changing to a lower temp one won't do anything).

What radiator service/ mods/ etc are to be considered? 
Airflow ducting changes?
Redline Water Wetter (despite the brown balls)?

TIA
Glenn