Many of the founders ended up winning president elections. If Mr. Jefferson or Mr. Madison, with all their disagreement, would like to obtain more tyrannical powers for the US President, they were in a position to do so while writing Constitution. They both were elected presidents soon after.
You're missing my entire point. The founders had significant local power their entire life. So they saw national power as something bad that could counter local power. They didn't want tyrannical powers for the president, that doesn't mean they weren't slaveholding authoritarians.
