With default QL data, I get 3160fps
To get the results you measured, burning rate (Ba) has to be changed to 0.5034 and this is a 17% increase!!!!
I have read somewhere, the Ba value cannot be changed more then 5%, as the simulation results would be meaningless.
I don't know why the difference. Do you see pressure signs? If not, maybe another speed check with another chrony.
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