Few Questions about my LSAT Timeline

Hello! I've been studying for the LSAT for about 3 months, and the last month has been the most consistent (10-15 hours of studying a week). I started with a 156 diagnostic score on PT 158 in April. Since then, my score has only gotten worse. My most recent PT Score was a 151 with a 164 BR score. On drills, I'm getting consistently higher scores, and my confidence is increasing, but with my goal of a 172, I'm not sure if I'll make it by my current September Test date. The questions I have are: how many hours a week do I need to be studying to get my desired score? Do I need to push my test date back further? And any practice tips based on the info above?

Thanks!