The 40s are very misleading: LG and RCs are a lot easier and LRs tend to use the same tricks over and over. The 50s and 60s should be fine though but I think LGs in the 80s are more time consuming (more brute-forcing your way through) if not harder.
I'm doing a bit of the 50s to assist in the September study group's progress along side that, I'm doing 70-80s with a deep dive into the material to strengthen my specific weaknesses.
This makes me feel a lot better. I was practicing with PTs in the mid 40s and some in the 50s and was getting in the 170s. Saturday I took PT 75 and got a 166 and was wondering why my score dropped.