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Could you post a picture of the furnace spec plate?
ECM motors (variable speed) can be installed... (google time)....part costs less than $300.
Assumption...not enough return air. Could you provide:
1. Measurements of both return ducts (ie: 16" or 20x25")
2. Measurements of the return air grilles
3. Roof insulation depth or R-value. ( mine was R19; 8 inches fiberglass, I went balls out and it is now R70,;24-30" )
4. Type of attic vent, est size of vent, soffit ( opinion as to whether attic ventilation can be improved?)
5. Opinion on noise level from air rushing into return grilles. ( too noisy? )
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