125 degrees is HOT after 75 second delay, what is the peak tempature while running? Is time delay digital with a board or a manual limit switch? I've not run into any board controlled blowers that don't have a selectable time delay. Manual fan/limit switches are also adjustable in most cases. You could always add a sequencer/time delay relay/fan control center to add extra blower time if you think it would help.
My furnace only gets to 106F after 10 minutes of running. Once the burner cycles off the blower runs for 3 minutes then tempature at vents is about 80f. Furnace is a 44,000BTU 90% with the 1/3HP blower set on the lowest speed.
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