And which inaccuracies would that be, specifically?
That it wasn't justified to have so many when there are only cosmetic differences and when we only have two versions of the P-51 Mustang, the greatest WWII fighter ever.
You casually dismissed any and all explanations of the differences almost as though you didn't read anything anybody actually posted.
As to the 150 octane discussion, there was a very lengthy thread about it when the Spitfires were updated and the Spitfire Mk VIII and Spitfire Mk XVI were added. My take at that time was that the Mk VIII should have been added at +18lbs boost on 100 octane and the Mk XVI should have been added at +25lbs boost on 150 octane. HTC thought that the +25lbs boost would have made the Mk XVI too powerful to bu uncontrolled (i.e., no perked) in the MA, something that is true.
I would have no problems with them changing the P-51D we have to an earlier block and taking off the rocket rails and limiting it to two 500lb bombs while, at the same time, adding a perked later block P-51D with rocket rails, 1000lb bomb capability and 150 octane fuel. At the same time they should raise the Spitfire Mk XIV's boost setting to +21lbs boost as it ran on 150 octane so that it might actually justify being perked.
An Allison engined P-51A would be nice at some point, but given the huge disparity in aircraft numbers for each nation, I have to think that is a pretty low priority.
As to the P-51 being the best fighter, I'll leave you with a quote from an American pilot who flew first Spitfire Mk VIIIs and later P-51Ds, both in the USAAF. "The P-51 can't do what the Spitfire can do, but it can do it over Berlin." There is no "best" fighter in all circumstances, but the best all round fighter of WWII was the F4U series, not the P-51, Spitfire or Bf109 series.