Hi jdman84,
Before you make any major changes to your study plan, I would take another simulation exam. I normally wouldn't recommend to take another right away but to determine if you have improved or if this is just an exam that was "off" from your usual performance (if you need somewhere to take another practice exam, you take one here with a free trial:
https://gmat.economist.com/). If you already have some practice exams available, it is okay to stick with those. The reason I say to take another if you are worried, is because simulation exams can range + or - 30 points from where you actually are and from that of the real GMAT. Therefore, it is possible that next time you take a sim test, you will see a jump in the opposite direction. If you are still seeing a decrease in score after your next sim test, then I would reevaluate your study plan. If you want, let me know how you do on your next exam. If you end up needing to make some changes to your study plan, I would be more than welcome to make some suggestions (but that is only if your next score is still a decrease). If you have any other questions please feel free to ask.
Good luck with your studies!
-Evan