I alternated load-outs on the J last night. Best I can tell, 75% of the time the light load out is a better choice. Your numbers may vary. In the attack mode the L, the full load-out is handy. I think I will try the P-38G with the light load-out.
I wished for two 75 gallon drop tanks for the P-38 which were common.
I agree with Bozon on the 47 except the D11 where I am thinking lighter is better.