The things with stats is thats it's all relative. I mean, if something works for you and it's over a decent sample, then why change. But when your looking for leaks, then stats can be used as a general guideline to discover what may be going wrong.
So if you have a 3bet % at FR of say 6-7% and its working, then fine. But if you getting owned, and getting 4bet light and stuff then comparing a general TAG stat in FR a 3bet% of around 3-5% is the norm.
Another example general TAG stats are regarded something like 14/11/2, 15/12/3, etc etc. But I think Tenbob has a much bigger gap between his vpip/pfr, something like 18/11/2 or something, and thats works for him which is great. So put these stats into perpective and find what works for you.