After having my 9/16 75D for nearly 2 years, the 4th try was the charm. Sent my car to the SC to get a recall item checked (hood latch), and to fix a door handle plus replace a headlight with burned out DRL (thankfully covered on my soon-to-expire used car warranty that I didn't even know I had until Tesla recently updated the phone app showing it), and for kicks I decided to throw in yet another request for uncorking...but this time, I did more more homework in the TMC threads which helped me come up with the following wording which I used under "Something Else" in the app's Service section:
"Would like to confirm whether vehicle is now eligible for uncorking (aka BP02 - Non-Performance Uncorked Acceleration - SI-17-00-005); I understand this involves an update to the performance configuration variable (from P3 to P1?) , then re-issuance of the firmware for the configuration to take)."
Apparently, this was the "opensaysme" I needed to finally get uncorked after all this time. Noticed the difference immediately when I saw the power gauge peg all the way to 300. The car feels like it's a thousand pounds lighter. I'm in love all over again! Thanks to everything willing to take their time to share valuable information in these threads!