ESS is a great tuning choice
8600rpm is 200rpm more than stock. Stock is 8400. Max power is 8300.
Cars have shown they are faster when shifted at 8600 vs 8400, however, it is obviously higher rpm means higher stress.
What many opt to do there is keep the limit to 8600rpm and only use the extra revs when needed
I can't really comment on servotronic. I don't think either option will affect anything.
I personally ask my tunes to have fully linear throttles. That's what I like, it is more precise.
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