"in the end we have learned that this "high proportion of 2 TAF Spitfires" were actually about 10 (ten) Squadrons, give or take a couple, most whom had very little or no actual contact at all with enemy fighters, and whom would be rightfully described by some as insignificant, penny packet numbers."
Quick check of Shores & Thomas shows that in the first 10 days of the invasion, Spitfire IXs of 2 TAF made 94 air-to-air claims (destroyed, probable, damaged) against Luftwaffe aircraft. Of these, 47 were made by Spitfires of 126, 127 and 132 Wings (equipped with the gyro gunsight as above), with a further 26 being accounted for by aircraft of 135 Wing (equipping with the gyro sight as above).
In short, most of the damage being done to the Luftwaffe in mid-'44 by Spitfire IXs of 2 TAF was being done by gyro-gunsight equipped aircraft.