I have owned several over the years. The following is the best tweek I have seen and comes courtesy of Gary Dyke
Change pre-infusion to 60 seconds and reduce pump power in 5% increments until you are hitting 9 BAR with your desired grind
Just hold down the up and arrow keys until this shows

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• ..and change it to something like 60 seconds.
Then press menu , this will show (with a different number )

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Change that to 95 , exit to confirm, and see if the max reached now is 9BAR. If not do the process again but reduce it to 90 and try again
If you use the blank disk and leave it running long enough the gauge will eventually creep all the way to what the OPV is set to 10.5BAR.
I would do it with coffee at the grind setting which is currently causing 10.5bar .
This is the link where you can follow the instructions and pictures
https://www.coffeeforums.co.uk/threads/sage-db-is-this-acceptable.32158/page-2