... have a grasp on the fundamentals, meaning I know what to ... see if I am lacking fundamentals, problem with timing, or just ... lack of fundamentals and then work my study ...
2-3. I mainly do time sections, I thought I would wait until I have mastered the fundamentals before attempting full PT's. Again, not sure if this is the right approach. After all, October is around the corner.
I think people falsely assume that taking time off will cause them to forget their fundamentals and how to take the exam. Trust me, you will not forget how to map out a conditional argument or identify the conclusion.
You're not doing anything wrong, except placing undue stress on yourself by focusing on the negative. Just keep practicing! With a strong grasp on the fundamentals (as evident by your BR scores), you should be at your target score soon.
I did PT 60s and I think they are comparative harder than 50s and 40s. Maybe it is because LSAC changed some styles. But the fundamentals are the same. Premise, conclusion, get the support, get the flaw, attack it or bridge it!