Hi!
A few question:
-how fast are you noting?
-do you happen to have mind-wandering problems?
-do you have some kind of daily-life practice? If so, can you note all day long without any major distraction?
-have you ever experienced vibrations at the Goenka retreats?
As for the 10 years-no A&P thing, that's not usual, certainly not unheard of. I think it's more a problem of consistency than of "not being good at it".
Here Seamus O's log, a guy with 10 years of irregular practice and no A&P, getting SE this September in about 3 weeks of consistent noting practice.
More in general, lurking in these fora I noticed that people meditating many years with no apparent result, then beginning a consistent practice and making fast progress seems to be quite a recurring pattern...
However, what are your current goals as far as meditation is concerned? What do you want to get from it?