I would leave it alone - a bit o trim drag is a GOOD thing - As long a landings are not "floaty"with the tail wanting to settle first -you are in the best shape - as for the thrust up or down? Phooey -- more down is actually better as prop direction (angle ) is closer to direction of flight .
Where did the expert fliers get their info?
The 32x12 sounds right too -as long as the engine runs cool and in the right rpm band . Really flat props on slow turning engines are not a great combo- I run a 30x14" pitch prop on my 160 ZDZJ and THAT is still a nice landing model (a 42% 300 Extra.)
Big scalebipea area whole lot better a litle on th nose heavy side-as long as there is adequate elevator authority.
My 30% Bucker Jungman is a blast to fly -I just hate rigging it at the field.