I don't have anything exact, but here is my experience so far.

My diagnostic score was exactly 160 and I was pretty even across the board in terms of strengths/weaknesses between the sections, with a slight strength for RC. Since then, I've studied for about three months (relatively steady at about 15-20 hours per week) and my score has gone up to almost 170 (scoring 168/169 pretty consistently). My blind reviews are around 172/173, which makes me think that the questions that I'm missing are simply due to moving too fast, mental slips, etc. My goal is also around 175.

I'll echo what "equallyyoked" said---the biggest thing that you should look to improve is getting -0 on LG. I'm getting closer to that point, and on my last PT, if I had scored -0 I would have gotten a 173, I believe. I started out averaging -6 on LG, now I'm averaging -3. I'm pretty confident that with another three months of studying I can approach a PT average of about 173/4. I'm not sure how much that provides regarding insight for your situation, but I figured I would share what ~200 hours of studying has gotten me thus far.

Best of luck as you go. I'm confident a 175+ score can be in your future. Just remember, short term outcomes shouldn't sway you. If you stick with it you WILL see your score go up!