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Thanks.

I agree with your best guess, that it could be some blockage on the high
side.

The car was recently purchased used by my kids, so we have no historical AC
data.

I did three similar AC compressor replacements with these same gauges in the
last month and all went 100% successfully - so I am pretty sure the gauges
are OK.

I pulled ~ 25-26 vacuum for ~ an hour with both low & high sides open.
That should have been enough to get the moisture.

Because I am doing it myself, here is the approach that I like, and will
probably
do in this case, assuming the problem persists.

1. Go to a local salvage yard & find the best AC compressor from a "wrecked"
car.
It must come from a reputable yard & have an unconditional 100% return for
90 days.
To test it, I pour in an ounce of the appropriate oil into the compressor,
turn it over by
hand to check compression a few times, then pour out the oil onto a clean
napkin.
It must have good compression & no foreign matter in the oil. Next I test
the clutch with
a 12VDC+ to the clutch pin. Finally, I spin the pulley and use a stethoscope
to listen
to the bearing free wheel.  If all of the above are OK, I install said AC
compressor.
Here is my logic for the above:
a. Factory AC compressor are WAY too expensive.
b. The lower priced new compressors are made in China.
c. The rebuilt compressors are the patched trash that were returned.
d. The used ones per above are the only ones that are in good condition &
low priced. So far, I have never had a bad one. Just check them out first.

2. Buy all new O rings, seals, dryer, filter, etc. - I even replace the
low/high port valves.

3. Remove the old compressor, etc.  & flush the system

4. Install the used compressor with oil, etc. , do a complete vacuum & leak
test - then
fill with 134a.

The TOTAL out-of-pocket cost runs from $100 to $250, depending on the car.

In that it is so inexpensive to just do it right, this is probably what is
best for this Honda.
It's really not worth the time and effort to trace down a potential clogged
point in the system
for $200 or so.

However, I really would like to know what the problem is with this Honda,
I'm just currious:-)

THANKS,
Gene