I know that the group of 51s I flew with were no help at all. The group leader stated before we even took off that his main goal was to just survive because he hated GVing
. Out of the 9 pilots in our group, not 1 P-51 got a single kill although on two separate occasions I had 3 190s engaged on the deck ripe for the pickin'.
I really wish that the guys afraid to fight in a P51 would just stay out of them. All they do is give a great aircraft a bad rep. 
I agree, I should of been bounced by 4 of the P-51s over A40, I had my jet turning under 400mph and turn fighting when wave after P-47's and P-51's were just augering into the town. When I started going after a heavy set of P-38s there were 20k P-51s and
none of them bothered to even make a pass on me.
I think people got discouraged, I was hearing the allies put up a pretty bad beating on the luftwaffe over 109, we held firm over A40 though.
My biggest mistake was not keeping an eye on my fuel, I kept race tracking at full power around 15k, the allies did knock out 3 of the 4 targets, however the main objective to secure A40 was not done.