I am left confused by your essay. You go through a list of reasons that were NOT behind the creation of the Electoral College, but you do not offer a clear explanation of what the reasons FOR the Electoal College were. My understanding is that, along with the Senate, it was part of a compromise between the more populous states and the less populous states. I never heard any claim that it was meant to protect rural voters.
You represent the Electoral College as a nominating body, with the House selecting the President with one vote per state. This implies that the large states were happy to allow the small states to have power equal power to their own -- which runs afoul of my readings of the controversies at the time.
You refer to a 'conflict of interest' but do not specify what comprised that conflict of interest. Whose interest was split between contending factors by what proposal?