300 checks though? sounds like you were just bored and didn't want to close the job out. most of the time it's just a loose connection or a bad ground that a reset would have fixed anyway.

Man that's rough, did you use gravel in the holes to help with drainage?

Three times with lopsided macarons? That's rough. I had the same problem until I realised my oven thermometer was off by 25 degrees. Have you checked your oven temp recently or was it just the scale that fixed it? Because inconsistent heat will mess up macarons way worse than a few extra grams of almond flour. A buddy of mine baked for years without one and thought her oven was fine, turned out it ran cold the whole time. Her stuff improved instantly after she got one.

12 hours into sanding one door myself, I feel your pain deeply.

Accelerator's fine for small jobs but you're trusting chemical reactions not to go sideways on something that could crack your whole foundation lol. I've seen too many guys rush calcium chloride and end up with surface problems later on. But hey if it works for your timeline and you're not dealing with temps below 20, more power to you.