The Yak-9K/UT and some U.S. planes (almost all of which lack autocannons and flight performance) are the exception, so all you really needa do to balance em is just make em cost more.
Because they didn’t check there are fighter around before spawn strike aircraft that why
It total players mistake.
other reason is that CAS pilot actually bad at flying if he fly fighter capable CAS.
If because most CAS pilot lack of flying skill and situation awareness then yes CAP can get more kill than CAS.
In short it possible that CAP can get more kill than CAS due to CAS pilot have skill issues and become CAP free kill not game fault
Solution
Check sky before flying that there fighter around
Fly better
How do you even come to the conclusion that “CAS players” (who also just so happen to be 90% of the player base) are worse at flying planes than . . . aparently . . . someone? No1 else other than CAS or CAP are spawning planes in GRB, so saying CAS and CAP players are bad pilots, you’re just comparing them to themselves.