Scenario 1:
Whenever your in the combat zone you should consider highspeed climb as your climbout option.. you trade climbrate for manuevering speed, and in the combat area this is a good tradeoff..
try 2k/min at 250mph ias in the 38...
(exp my zeke has been doing 1.5k at 250mph recently)
at 250 you pop flaps and manuever with just about anything becuase thats near your corner velocity..
If you turned at first contact you could have gained enough distance to give you options for a reverse. At 18k you got plenty of air to out turn these guys.. Dont wait, make your choice and follow thru with it..
In the p38 you should be using Bruce Lee tactics... Be like water.. when you enemy comes hard, parry soft (turn and burners use e tactics) When enemy comes soft, hit them hard.. (use turn and burn against Boom and Zoomers)
38 is real jack of all trades, you got into a tail chase and thats no good.. Mix it up in that enviroment..
Scenario 2:
Wipass sums it up nicely.. Why you were you engaging two higher cons in a e fighter/B&Z mobile... In zeke (not recommended) or spitfire or some other turner and burner you have more leverage with a lesser e state but in a stang you really need every ounce of E you can muster...
At first contact interrogate them (check for radar blip, there heading, relative speed) if they are cons not friendlies and your in a e fighter grab and then engage them.. At a minimum of equal e states you hit them... One plane maybe youll be able to mix it up but 2 or 3 is not recomended if you want to survive considering your paltry e state vs higher cons..
In short avoid higher con engagement when you dont have #'s, exceptional pilots nearby (thats tenative) or your not in a turn and burner...
2 cents
DoctorYo