apologies for the delay, the updated version has been released today.
In the new version (1.1.02) I have added a new variable to the Expert Properties called MTF_update_frequency. This value determines how often offline charts will be updated. The default value is 3 but please do some experiments and let me know if this helps.
I know that changing it from the expert properties is not ideal, but this way I could add the option without putting any additional load on the client computer and not slowing the test down any further.
Please let me know if this helps.