I've finished the button bands and am pleased with them. I now acknowledge what I knew all along: the armbands are too tight and the shoulders are too wide, which gives a odd bunched effect - not good! I'm going to ponder their future. I think what I'll probably have to do is cut away some of the shoulder width and thus bring the armbands in, plus pick up 4 in 5 instead of 2 in 3.
Why don't I just follow patterns? Well I thought I needed to increase the stitch count because I thought the top as written would be too small. Then I didn't want to do a v-neck, and so it goes.