Hi rdhmasen,
The Verbal score drop that you experienced on Test Day is likely due to one of two likely "causes": either something that was unrealistic during practice or something that was surprising (or not accounted for) on Test Day.
If you can answer a few questions, then we should be able to figure this out:
When you took your CATs:
1) Did you take them at home?
2) Did you ever do ANYTHING during your CATs that you couldn't do on Test Day (pause the CAT, listen to music, etc.)?
3) Did you ever take a CAT more than once?
On Test Day:
1) How did you sleep the night before your GMAT?
2) How long was the ride to the Test Center from your home?
3) Were there any distractions at the facility or during the Test?
4) What did you do during the two 8-minute breaks?
5) Did you finish any sections early?
6) Did you have to rush to finish any sections (and guess on questions just to finish on time)?
It's possible that you just had a "bad day"; but if we can figure all of this out quickly, then you shouldn't wait too long to retest.
GMAT assassins aren't born, they're made,
Rich