Thoughts on nbme 20, 6 Weeks out

I recently took the NBME 20 and scored 221 and currently 92% of total Q's (current score 67%)through uworld first pass. I took the NBME 16 almost a month ago and score 219. Not a huge improvement so a bit concerned. I found NBME 20 to be a bit more challenging. Few Questions going forward.

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1. How would you go about studying from now on? Do more review material or emphasize more on doing questions?
2. Do you recommend going through UWORLD incorrect or reset?
3. I heard UW2 and NBME 18 is the best score predictor. Does that still stand considering NBME just released new exams?