166 in Sep --> 172 in Feb --> 171 in April.
I'm bummed because my average score (around 13 PTs since my Feb test) was a 177, with multiple scores hitting 180 and only hitting below 174 once. I was so confident going into April, but I feel test day nerves got the best of me - I had one LR section I didn't even have time to review flags for, when I usually have 10 minutes.
What do I do here? Does retaking again and keeping a plateaued score send adcoms a message that I'm just trying my luck regardless of a lack of progress? Would a 173-174 score be meaningful atp? Can I expect to overcome whatever test-day problems I have with a June retake?
I have my registration paid for (after a panic from that very nasty April exam), so I have 24 hours to decide. WWYD??

Very similar situation, and I think it comes down to the fact that test day variables are always crazy, no matter how much you prepare.
I was a 166 scorer in September, raised to a 172 in Feb, and just got back a 171 from April. I'm bummed because my average was a 177 from around 14 PTs leading into this test, and I just feel a bit lost, but I am truly still considering a retake in june.
Definitely don't cancel your 166! It's a great score (especially for a first score) and any improvements will just show further dedication.
As someone who is constantly seeing lower official scores than my PT average, let me know if you solve the problem of test day anxiety!