Hi, WonderWander. I was reading your comment and I wondered: are you wearing "regular" width Speedgoats? Perhaps you need the wider width. It's also important to make sure that your sock goes with the width of your shoes, if they're really thick you will need more width.
I love my Speedgoats. When the original insole gets a bit dead, I put a new gel one in. I accept that the nonslip soles don't last as long but that's okay. I can walk on wet marble if I need to! (Not to mention that high alternative on the Norte that goes through pastures...the day we took it there was rain, so of course no famous views. The path had become a marble-bottomed flowing stream.)
HTH
BC