The current version of the Spit16 is used as a dog-fighter regardless of its hard points. With its super ability to turn, climb, roll, run, gun, and ability to carry 1k worth of ordnance, I think it is still under-rated and it has far too much of an impact in AH, MA or scenario.
There are few things worse than having an aircraft meant for one thing and used completely for another. The Spit16 is the poster child for such things.
If there was a way to have an low altitude attack version of the Spitfire without all the fanfare as the Spit16, and the Spit LFIXE for LW use, then a lot of the issues would go away. Im not sure which other Spitfire was used as a ground pounder. Perhaps the Spit16 without the clipped wings?