One thing you might want to look at is your endurance. When the Quant is very high and the verbal is very low, look at the endurance for the test.
When you practiced, did you do the AWA also? That 60 minutes of thinking and analysis is a big factor in draining you. It's like training for a marathon and then adding on 33% of the distance to it. If you do only Quant and Verbal in all of your practice tests, that should take about 2.5 hours or so (75 min x 2), but if you add 60 minutes for the AWA, 60 minutes is a huge percentage of 2.5 hours, so your endurance must be up to par to handle 4 hours (adding in two 10-minute breaks) of intense focus. My first thought is of endurance when someone scores Q47+ and less than 35 on the verbal. The person is obviously very capable, but didn't perform on that particular day. Unfortunately, that's the day that gets recorded.
I scored higher on test prep stuff with
MGMAT, Barons, 800Score.com, but I don't count those scores because I didnt' do any AWA with those so it wasn't testing conditions.
What time of day did you take your exam? People think best in the morning. If you took it in the morning, did you eat breakfast before you took it? Eating breakfast gives our body fuel and that helps us think better. If you took it in the afternoon, did you eat a big lunch before? Digesting food can make us sleepy and make it much harder to focus. Lack of breakfast can make us hungry and thus harder to focus when we're hungry.
These are my thoughts. I hope they help you regroup and take it again to get the score you all deserve.