Hi Matt,
You mentioned two things that stuck with me:
1) You experienced a drop off in score from practice tests to actual test
2) You're wondering if you should just do lots more OG questions
Here are two things that you should consider directly related to the above two things:
1) Practice to Actual drop offs are usually about test taking skills / solving strategies. If your problem was concepts, then you'd be struggling in practice tests too.
2) Practice problem and practice test effectiveness drops drastically as you get deeper into your prep. Especially on retakes.
UNLESS, you know exactly what your gaps are and do practice sets that specifically target those problems.
We can get you well along the way to solving both those problem with our FREE diagnostic session with a live coach. If you're interested, DM me to setup a quick 10 min intro call to set it up.
Arvind