Good news! It turns out the SmartTOP module was interfering with the flash process. After disabling the module, I was able to flash the car with very little effort at all. In fact to those interested, I did not use a battery charger and the writing process only took 15 minutes.
I took the car around just before and the throttle response in all modes has noticeably improved, especially in Normal mode. That annoying lag has virtually disappeared. I then put it in Sport+ with manual shifting and did a little WOT. The feel is very linear but it's very clear how much extra power there is.
I'm very happy with the tune!
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