I had a similar issue with my old 302 combo in that I was running too cold of a thermo. I think I was running a 160* at the time (don't laugh too hard) and the darn thing was running soooo cold with my huge Griffen radiator.
If it's been a while since you changed the O2's it's a good idea regardless. However, if it is the O2s and you're running too rich, wouldn't all the plugs be fouled?
Let us know how the 192* thermo and new O2's work out for you.
Good luck,
E
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