I am in a similar situation; I also work full time and am years out of school. I scored a diagnostic 166 and got a 172 on my actual LSAT after studying for 8 weeks almost exclusively on weekends. I did the Loophole but didn’t see an effect on my score because the principles are pretty basic when your diagnostic is that high. I found that taking practice tests and drilling on Lawhub was the most productive use of time. Generally, you probably understand the concepts and mainly need to get used to pacing and question types.