I've seen versions of this asked a few times, but the answers vary and the ones I've seen don't jibe with WHM instructions.
If I have my own name servers, then WHM says my primary nameserver must be listed first. Okay, I can do that. Do I have to follow it with any others, like 127.0.0.1? WHM says I do because if my only resolver is down then I can't resolve, but if my only resolver is me and it's down then I don't care much anyway about not being able to resolve because I prob have bigger problems.
I had it set up with mine first, 127.0.0.1 next, then a planet ns ip third. It seemed to work okay, but when I click 'manage nameserver ips' in WHM, it takes a really long time like a min or two, or sometimes not at all. Maybe coincidentally, but when I changed the only resolver to only me, that problem went away.