well,
I am having the same problem with my p 51 d, i thougt i was doing something wrong having all this down trim on the elevator
for the moment i have the cg set at 146 mm from leading edge but this thing goes up faster then a hot air balloon
i will try the cg at 130 as you suggested, i also checked the wing wich was at + 1° maybe this is the problem i am wondering if the other esm's have the same problem
i also have a topgun spitfire which is a joy to fly, but this mustang is giving me a fit
at least now i know i am not the only one with this problem
regards
dirk