If you choke it back to one or two voices occasionally, then hit the musette or master when you are about to begin a different part of the tune, you're adding another dimension to your playing. I would imagine with your style coupler changes can be a swine, but if you can manage them mid tune you'll get what I mean. In the early days I found with my rear mounted French couplers that a change could throw my hand position off to the extent that I lost track of the tune. I used to record myself playing using old fashioned tape recorders, and seldom changed coupler during a tune in case I fluffed it. I don't have any accordions with couplers on the front, so I can't compare them. With my boxes it's a case of remembering which switch does what and trying to get the changes right, Even yet, I sometimes get surprises when I find I've selected the wrong one.
Playing LH bass has always been a weakness with me, and Bob's advice is way out of my ballpark. One day I'll take playing the basses seriously, but I know one or two pro players who can only do the basics, same as me.
You've more bottle than Fuller's brewery putting yourself on You Tube, and I'm sure most members will learn something from each of your posts. I'm wading back into playing after a longish break, and if I ever get the hang of how to record myself playing these days I might have a go. I've still got a lot of practising to do until I get the old techniques back, so don't wait up for me posting!