you are an idiot.  he has worn other brands of contacts without these
problems.  furthermore he states that the problem occurred between
different lenses in the box, not with every pair.  vertex power
differences are the same between every brand of contact and don't vary
between difference lenses in a box.

just because you know that vertex distance is an issue when choosing
contact lens powers doesn't mean that everyones contact problems must
be related to that.  once again you give yourself too much credit for
understanding things that you really don't.  your ego is larger than
your understanding of vision.

to answer the original posters question-- I have not noticed any
problems with batch or lens variability with AV Oasys.  In fact I am
rather positive about the lens-- most of my patients seem to like it as
do I.  It is a healthy lens for your eyes, and it is comfortable as
well.  I have heard other docs here in this forum comment that the lens
seems to accumulate deposits after about 2 weeks so it may get dirty a
little faster than some lenses do.

I can think of only one plausible explanation that is related to the
lenses, as opposed to being merely a coincidence.

Oasys lenses come only in a base curvature of 8.4.  If your Advance
prescription was for a base curve of 8.7, it's just possible that your
eyes are a bit too flat for the 8.4 Oasys lens.

One easy way to check is to look in the mirror, then press upwards on
the lens through your bottom eyelid.  It should move up on your eye
with no effort.  Or, have someone look at your eyes while you blink.
The lenses should move up and down as you do so.

If not, then they're probably too tight, and shouldn't have been
prescribed.  

As if that weren't speculation enough, however, I can't say I have a
clue whether or not tight contact lenses would produce those symptoms.

Needless to say, if you haven't already, go without contacts for a few
days, and see if you have the symptoms with glasses or not.

Good luck.