The actual average ping doesn't matter so much in the smokeping. What you are looking for in your case is evidence that you have a congested node (or other problem on the cable side). If you watch the times when your pings start to spike, you'll notice that it's "prime time", or when everyone else is getting on.
See if you can get SDL3Tech here on the forums to look into it for you. Possible it could be a network setting issue.
30/2 Suddenlink : Current
5/1 CMA : Old
15/2 TWC : Old