You may have missed a few things. Truly the ability of the founding fathers to control the fledgeling United States was crucial to its survival. The abilities of this group of men cannot be underestimated. However, they were not aristocrats (and royalty is laughable) in the old world sense of the word. They may not have been examples of the rags to riches story in the modern sense, but they were certainly not inheritors of ancient political control either. In addition, the colonies already had a considerable experience with democratic institutions long before the revolution. The men who were in charge by the time the revolution came about had practiced some level of poilitical control (mostly democratically based control) for some time before the war.
In France, the principles of Liberty, Equality and Fraternity somewhat dilluted the idea of “equality of men” with the idea of Fraternity. The Russian revolution diluted it further with the marxist philosophy of the dictatorship of the proletariate. Neither of these revolutions benefitted from a history of democratic practice that the colonies had. Their subsequent problems can better be understood by seeing the ways that they diverged from the “equality of men” concept. Expecially considering that the only thing they (more the Russian example than the French) had in common with it was the desire to through out the kings.
I think you will have to demonstrate more clearly how the American revolution did not carry the theory of “equality of man” to sufficient extent. And you may need to demonstrate that the French revolution did. I certainly think that your evidence for the Russian revolution as an example of more “equality of men” than the American is “lacking” to be kind. Remember, you are questioning the link between the slogans and the activities of these regimes. So simply quoting their slogans will not be proof. What you will have to do is demonstrate that these other regimes granted more power to the theory than did the fledgling United States. Did either of them hold popular elections for their legislators? Thier executive leaders? Which of the leaders of the revolutions who eventually took power (Washington, Robespierre, or Lenin/Stalin) voluntarily give up that power? Which of these regimes proceded to solidify its power through force by executing its rivals?