Scanning negs is notoriously difficult, no matter what program you use.
The biggest thing is that the software will automatically try to set the 'correct' white balance based on the colours in the film. So whether you include the rebate (or even worse, sprocket holes) in the scan area will greatly affect the range of colours that it will scan and output.
If you include just the image with no borders or holes, the white balance comes fairly close to neutral, so whatever 'quirks' you may get from being expired or cross-processing are smoothed out and the result is what you've got, some fairly 'normal' looking pictures.
Of course, if you RA4 print them, you do the white-balancing yourself with CMY dials and end up with the same thing, give or take.
But hey, if it ain't broke, don't fix it? I reckon you've got some great shots there, of course it may not have been what you were going for. If you want weird and funky washed-out or just 'wrong' colours, try scanning them 'wrong' too. Or throw weird chemicals in your developer, or microwave the films first or something, that'll give you weird results too...