I have been told by my current GI that manometry is quite often inconclusive. It will tell the doctor when something is obviously wrong, but just as often not offer any indication of issues. I don't know how to interpret the results, but I read the doctor's comments on mine (with similar results to yours), and he noted that they are "normal".
On my test, under Postoperative Diagnosis, is this:
"Normal motility study, although there are 3 of 12 swallows that are ineffective. This does not quite meet criteria for ineffective esophageal motility, as 30% of swallows should be ineffective. In this case of 12 swallows, that would require 4 ineffective swallows."
From all the symptoms you've described in past threads, I would say that you have LPR. The stomach pain is something else, but it may be contributing to an overproduction of acid. Reflux, in and of itself, does not necessarily mean an overabundance of acid -- just that it isn't contained in the stomach where it should be.
For most folks who have LPR, it's pretty difficult to distinguish between actual acid, non-acid reflux, and vapor. But all you have to do is take a look at one's own individual symptoms and guess...