Struggling with RNG in Actual LSAT

Oni LSAT

Dear fellow 7Sagers,

I've taken the LSAT three times now. I took it cold in 2017 June (PT 81) without every seeing an LSAT material and got a 151 (stupid, I know). I never touched the LSAT again until 2020 where I took it in May (169) and in June (171). However, these are below my PT average of 173. My section averages can be RC -1 to -3, LR -1 to -3, and LG -0.

The problem that I've noticed in the LSAT is struggling in section while doing great in the other two. In May, I felt like I aced the RC and LG but then in the LR, I somehow forgot how to read and had 8 flags before time ran out. In June, I felt like I killed LG and LR but was completely destroyed by the prescriptive vs descriptive and especially the sunken ships passages in the RC.

My question is that how can I ensure that I am able to perform in all sections regardless of difficulty? I usually don't run into this issue in my PTs. Is this a common issue during a take? I've done almost every PT above 50 and drilled 10-49 during the CC and warm-up drills.

I'm taking the August Flex for my 4th time in order to hit my average or above. Thank you for your time.