Brian
First of all, the guidelines are clear, no matter how you play with semantics, you SHOULDN'T call anyone out (like it or not). If you didn't know before, you do now.
Second, the definition of sandbagging is pretending your skills are worse than they actually are, in order to cheat and gain an advantage. In this game this usually means they want to cheat people out of their credits. The person you're calling out in your blog has been a member for 7 months, so his XP level is actually pretty low. The fact that he has only 6 MP wins and doesn't play much skins and no prize stroke tournaments shows no such activity.
He seems to like playing alt shot games, but he won only 52 % of them. His blitz scores are very mediocre and his 64 avg comes from a round of 32 on Kiawah, which is really nothing special for someone playing 7 months from hack tees with L59 Pings and Nikes.
All these stats do not point to cheating, but to a social recreational player with no extraordinary skill. The fact he doesn't play ranked rounds is perfectly within the rules (again, like it or not), especially since he doesn't seem to "steal" credits from anyone.
With all that being said, there are many of real sandbaggers around, so if you decide to keep that "shame list" on your profile, fine tune your stat reading skills first, after that, be my guest. I could give you (but I can't) a list of at least 100 IDs, who are (only IMO, not a proved fact) a 1000% more blatant and worse cheats of the top of my head.
i'm not trying to pick a fight here, I just wanted to give you some pointers about what is within or outside the rules here, and how to correctly spot the real offenders and don't call out the smallest fish around.