Hi Rafael,
First if you double click on the entry in the load profile allocation tab then you would be able to see the updated usage factor status in the load profile factor tab.(Check attachment)
Second usage factor is updated after Billing processes, so working on it before or during the billing execution is not possible. One can ofcourse go for enhancements.
Period Consumption and Usage Factor Concepts - Energy Data Management - SAP Library
The history table for usage factor is EUFASS. Also check exit 'EXIT_SAPLEEDM_USAGEFACTOR_003' and ES 'ISU_EDM_USAGEFACTOR'.
Correct me if I am wrong : If your scenario is that you want to compare a non interval consumption with a fixed interval consumption then it would be better to skip synthetic profiles and use normal profiles and execute this check using variants in the rate steps.
Hope this helps. 
Cheers,
Rakesh..
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