Set "event at bad trigger position" to "just show (default)" = which is the default setting.
I don't think this setting is the problem, but you never know. You never said if this caused the engine to stumble before you let your foot of the gas, or after.
I would fix some of the below first :
Unless you're actively using the knock sensor, which is highly untested with recent firmware, I would set "knockchan" to 240 as is recommended to turn it off.
I think you are using way too much ignition advance on low cruising load, but you may not spend much time below 80 kPa with an aggressive driving style..
You're running the engine far too lean in my opinion, this could make the engine mis-fire and cause trigger errors. Lambda 0.90 at full load is for N/A engines only and they usually run richer than that. Set to 0.82-0.83 for anything above 30-40 kPa boost (160 kPa row and up for you).
Most importantly, you have set the laws of physics out of play by setting the MAT/TPS enrichment table to 100% all over. Drag'n'drop the default table from one of the config files in the "VemsTune\defaultfirmwareconfigs" directory.
Your tune will change a lot depending on ambient temperature if you don't do this!
Make sure input functions you're not using are disabled, two are not and you're probably not aware. In this case they were not dangerous.
You're not using the correctly calculated req fuel if your injectors are truly 630 cc/min, but they probably are since you have higher values in the VE table than what you'd normally see. You should have 4.5 ms, not 3.1 ms. This affects the scaling of some of the enrichment functions.
Since you've enabled EGO correction for all loads you can use it for tuning with "VE tune by statistics" in the Tools menu. This makes it easier for you when you have set the MAT/TPS enrichment table to the correct values. Just drive around for a while and let it suggest VE changes. Apply those and manually smooth out the table and you should be good to go.
I would not recommend any EGO correction at full load in the long haul. If you need correction at those loads you usually have a serious problem somewhere and you should not trust the lambda sensor for this job. On an Audi like this I would disable it above 120-130 kPa and 30+ % TPS, so it never correct when you "get on it".
Some other things could probably be said, but these are the most obvious ones from a short 5 minute review.
