ur calculation of stars and their magnitude is somehow grossly over optimistic la. sure, 13.5 is alot more than 12.5, but back in sg skies, 13.5 for a 8" is challenging.
also, i have never seen anyone so disgusted by the views thru a 3" tak that he/she eventually gave up the hobby. in fact, some bigger objects looks wonderful thru premium 3" refractors, m45, veil, lots more to list.
~MooEy~