On top of that, of course, the idea that the RN was dog meat for the LW is vastly over-played in a lot of popular media. Even at Crete, where the RN was operating hundreds of miles from its bases and therefore often running low on AA ammunition, the RN was far from wiped out; it suffered severe losses but it overwhelmingly carried out its missions, including stopping invasion convoys.
But in Crete, the Lutwaffe had a different primary task and that was to support the airborne units. Most air operations were aimed at capturing the island. Attacking RN ships was a secondary objective. Furthermore, the strength of the Luftwaffe was very limited, some reasons:
1. poor airfields in the area, moreover there were few, which reduced the strength of the Luftwaffe in the area
2. lack of fuel, if the Germans had not recovered the supplies of aviation gasoline left here by the RAF, their air operations would have been further curtailed
3. unsuitable aircraft, much of the attack on RN ships was carried out by Do 17's which had a small bomb load, in addition they carried out their attacks from higher altitudes
4. poor infrastructure in Greece, which made it difficult to supply the Luftwaffe, resulting in fuel and bomb shortages
5. the long distance between the targets, which did not allow the full potential of the Ju 87 to be used, which mostly used only SC 250 bombs, only rarely were heavier ones used
All very well described in this book: (
https://www.amazon.com/Air-Yugoslavia-Greece-Crete-1940-41/dp/0948817070)
Airfields in France would be much better supplied, closer to the operational areas, and the Luftwaffe strength would be much greater. Units equipped with the Ju 87 could use much heavier and more effective bombs than just the SC 250. British losses would certainly not be small as you claim….