I don't quite understand.
You say that the setting controls the timeout between the browser and booster and booster and the host.
The poll happens from the booster to the host. So unless you have actively chosen that the poll timeout should follow its own rules, the poll timeout aught to be the same as is configured in BOOSTERPortTimeout.
If you have the poll timeout set to be different from the BOOSTERPortTimeout, what is the timeout?