OK

So , the higher fan helped to some degree.

So , your orig question was is there anything you could do to help get better cooling and less over-heat..

The ac cooling will be the hard one b/c of the 134a system...Should have stayed w R12..but the engine temp can be checked a bit and that will in effect help the ac system.

Here are a few simple things that will help both ac and over-heat temps:

You can bridge the blu sensor with a resistor to make the high fan come On at a lower engine temp ..you are just lowering that sensors fan cut-in temp, getting a high fan before the coolant starts to rise b/c of your high ambient temps and climate. This works well and is cheap MOD to do.
ARCHIEVES [ or you can buy a ready made one from JIM F. here]

You can change your thermostat to a lower opening temp one ..fairly simple.

You can change the ratio of AF/H20 to 40/60 ratio. That will help slightly.

And you can add a cabin sw to allow activation of the low fans manually . BY addinga relay to that circuit, you can also up the low fan speed to high for the ac operation. A little tricky , but anyone familiar with relays would find that easy.
B/c your suction line is not as cold as it was , I also would have the refrigerant level checked for capacity..that is something you are going to have a guy w/gauges do. B/c your low fan are coming On by themselves , if the refrig level is low , it will only be slightly low b.c there is enough in here to trigger the low fan pigtail sw. [ a low on refrig system first sign is no low fan trigger ]

And lastly, b/c airflow has made a difference, I would clean out both the condenser fins and radiator fins with soap and a garden hose ..a car that old get full of dirt and air-flow restriction is your enemy. The a/c system can only take out the heat that the condenser can dissipate. The clener the cond, the cooler your car will be. and the cooler the temps will stay.

Most of this stuff is not yor Bag, but any decent guy could do these for you.
You could handle the cleaning of the cond/radiator and you could also do the blu sensoor mod if you had the ready made part. Both will help.
That's about all I can tell ya..........

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A Dalton