My guess…you can get yourself up over 100 points.
My D took a prep course and get a 1370 first try. Took it a second time and got a 1460. She really felt she could do better and took it a third time and got a 1500.
Your baseline at 1390 is strong and your study plan for taking the test again is much more disciplined and thorough than what my D did for her re-tests.
So I say to you…YOU CAN DO IT!!!
Good luck.