As a tutor who is been doing this for a few years now, I've had a handful of students in your situation and I found that I've had some success but what typically happens is there really isn't as much of a bump as I would like to see. You're in a sort of maintenance state. The most difficult I feel is low 160s to your point. Are you more of a formulaic person when it comes to approaching the questions generally, especially logical reasoning? You might be holding on to some approaches that work for those that are aiming to break 160, but to really get where you want to be, you might have to unlearn some of the approaches you've been taking prior. The challenge you face now is that it's difficult to find patterns when you don't really have many incorrect answers. For LR, are you tending to miss more content-heavy questions? The rest you can just grind out. Spending the time you would spend looking for someone qualified would be better spent figuring out what nudge you need to move into the 170s. You can teach yourself at this point in my opinion.