Surprize surprize, cooling issues

[67FEfastback]

This is a 'stang, but I assume some of the cobra guys have dealt with cooling issues, once or twice.

I have already done a whole bunch of troubleshooting
replaced a bad thermostat
replaced a bad fan clutch
replaced a bad rad cap

The good news is that I did not boil over. It got very hot a few times
The bad news is that it's fall weather here and very cool outside 10 C +/-

My car is heating up a lot in stop and go city traffic.

Seems to cool of at speed better.

I have a big block rad, shroud, and big block clutch fan (now working I think)

I was thinking of adding an electric pusher fan - what do you think?

Should I consider a big aluminum radiator?

The New MR gasket high flow thermostat failed. I replaced it with a stock type thermostat. I have a 16 lb rad cap and overflow tank with an edelbrock aluminum water pump.

The fiberglass hood that I have, does not have the cut outs (louvres) in the top.