7 of your top 10 SW are on my own top ten list and I also listened to Morricone before I actually many years later watched my first Leone spaghetti western, but it was not the fantastic Ecstacy of Gold I had heard before but the main theme from The Good, The Bad And The Ugly which was a hit on the Swedish pop music chart.
Regarding Navajo Joe on your list which is not one of my own top pick’s (but I bought it last year as a newcomer because of Tarantino’s list) maybe you as a student with a younger more flexible intellect than many here could help solving the appearantly extremely difficult Esperanza railway station location mystery 
Exactly where were those scenes shot that you see when the train was arriving to the Esperanza station or it stands still at the station or leaves from the station ?