Belt tension and jerk questions

Hello,
I have a vcore 3.1 400mm enclosed printing mostly ABS. My belt tension is clearly too low but I'm not sure what values I should be tensioning too. Does anyone have a well working reference for the corexy belt measurement I should shoot for?

Additionally my pressure advance is clearly too low but when I run a tuning tower (or any print for that matter) my jerk will occasionally jump up to 10mm/s. Didn't see any settings for this in super slicer but I'm probably missing something. Any help on either question would be much appreciated, thanks.
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