I've done the searching but I can't quite determine based on what I've read if I'm starving my poor starter.
I keep my starter on the counter. I use it every couple of days. Recently I was feeding it on a 2:1:1 twice a day. It grew very quickly and started becoming foamy in advance of the next feeding.
I then read that that is not enough so I switched to 1:1:1 and now the same thing is happening. BUT I've also read that feeding it too often will dilute it.