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I see a couple options.
One is to buy a couple mini splits to supplement your upstairs cooling.
Two is to remodel a bit to greatly improve your duct system. Try to pipe in returns into increase circulation...you probably need twice as much cfm to the upstairs returns into the rooms. One method would be to chase a return into a closet to the attic and install ceiling returns. Another method, add jumper returns to the ceilings of both bedrooms and the great room.
One saving grace could be that the heater could later be changed to a lessor output...which means...
A good HVAC guy could look at your house and do a basic load calculation of each room and make a proposal to increase circulation, and the amount of air flow to each room needs. They are fairly good at this and it comes at a cost.... he will tell you what you need to know. If he's an older tech, he may be able to "derate" your furnace...something some guys won't do.
I'm guessing ventilating the attic properly might relieve some usage.
For your blower motor, you can get information by googling "ecm blower motor swap retrofit"
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