Did another test with your images and one of my negatives that I already tested with backlight coming from a Durst M605c enlarger, a Kaiser plano lighttable and my iPad. Resulting images look similar. The original shot was taken in 1978 on Kodak Safety Film 6014 which translates into Kodacolor II according to this page.
The colours I get from negatives from around that time correspond to the ones I see on prints that I had made then. The colours don’t compare to what we’re used today, images taken by digital cameras that are most often way too saturated. Colour negatives did not provide the saturation we see today, except maybe the fujifilm negatives, taken with a slight overexposure…
Now, what is great colour? It is most often a matter of personal preference and I often get what I want from Negative Lab Pro. Some of its results ask for further processing that I do on 16bit TIFFs, NLP’s result gets to be an intermediate result in these cases, something that I can live with (not all of my shots are winners 
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Do you have a print that was made from the original negative? Does it show the colours you like? Are they your reference?