do you mean the main blower or an augmented blower inside the ducting?
I actually added an inline duct fan to get air OUT of a room that didn't have any registers. Something like this:
https://www.amazon.com/VIVOSUN-Inline-B ... c5f3ad1001If you have access to the duct work you could add something like that on the rooms that need more OOMF to get the air there. You could automate it where it only turns on or off at a specific temperature as well.