Ill try to be patient...
1. Outpost boats were not "flak ships", were just that, outpost boats (often requisitioned fishing boats), they did have some AA guns, but that did not make them flak ships...
2. You are thinking of the 3,7cm LAND flak, the KM used the
Germany 3.7 cm/83 SK C/30 - NavWeaps, HAND-LOADED SEMI-AUTO, RoF about 30rpm, until 1944, when a modified version of the land flak 36
Germany 3.7 cm/69 (1.5") Flak M42 - NavWeaps was introduced.
3. Those
Germany 2 cm/65 (0.79") C/30 and C/38 - NavWeaps were all magazine fed (20 roudns) and air cooled, which means reduced fire rates.
View attachment 536916
4. UK air attacks werent much of an issue until late war, which is why the KM kept their old weapons in use for so long, the threat wasnt there, when the threat increased they issued 40mm and 37mm M42s, but by then they had far more pressing issues than protecting shipping...
5. Word of advice, never use Wikipedia as a source... just dont.