What did you expect?
Ramstein didnt you have a 10 page thread in ORR about the same issue? I mean .... how many times doesn it have to be posted that fuel tank CoG is not modeled in this sim? I suggest that you just get used to it as it is and take some tips from
Klingstroems Tips on Flying the P-51.. thread and
JTD's thread as well. If you ever get a hit in your wing toss all that out the window.. you will stall and crash especially down low. Does the plane havea few issues? Yeah I think so.. but I have found that altering the way you fly and your stick settings will bring out new life to any plane along with practice..