I only go with what sources I have, since I wasnt there.
Barret Tillmans book on the Hellcat doesnt seem to support that they were that happy with it. Most units had jamming problems, which is why it was not widely used.
I also read the book of Major Porter, USMC ("Ace") the only night ace from the US Marines, and he wasnt a fan of the 20mm either, despite his mount "Black Death" being so armed.
Night attacks involved closing to fairly short range on an unsuspecting bomber or fighter, and blasting them, vs Japanese a/c, they trouble of "making a 2nd pass" would have been a doubtfull problem.