I'm sorry to not have responded in this thread sooner, extenuating circumstances, hard to do everything.
The usual suggestion here is to turn on the 'Forced Mode', which it appears you already found. Some processes adjust their own CPU affinity and priority classes, so this option tells Lasso to go ahead and fight with them.
However, something doesn't seem to add up. You hit the nail on the head- Can you show the logs when you launch a process you've set the default CPU affinity or priority? I really need to know what the governor tries to do, if anything, vs the final outcome.
You may also want to try reinstalling the product and make sure you have selected to 'Manage processes of all users'. If you have installed the product under a limited user account, you may even want to try running the Governor as a service (another install option). Ignore the warnings about the caveats of doing that for now.
Thanks!