I finally got my fonts where I want them so I have actually been reading for a change.

I had to resize all my fonts. I use my K4 as a guide on size 5 so now all my fonts match very closely to size 5 on both Kindles. I was getting eyestrain from having small fonts.
Unfortunately Size 4 on the PW is still too tiny. I would have to make a font Huge in order to get what I want but I can read comfortably at Size 5 so I've grown use to it. I suspect if the contrast was better on my PW I wouldn't have needed to do this.
I did make Palatino taller you are not seeing things. I like it much better now.
I use Amasis are my main font but it's nice to have choices.