In my opinion escorts are a waste of time against me163s. Your only real hope is someone presses beyond 500mph and goes into compression - assuming the bombers are operating above 25k in which the me163 does accelerate rather fast and tends to compress, however it can come out of it.
I've seen all kinds of escorts, Me262s, P51s, Spit 14s etc none can take on an Me163 unless its an extremely novice pilot.
I've shot down my share in the 163 and faced enough - Its perk is rather generous considering any pilot with at least a years experience can handle and fly a 163 with ease and score a few kills. True they do blow up, but the 163 holds all the cards to get in position, and get a few kills before fuel/ammo is gone.
I've also had buffs shoot me down, while the 163 can take a few rounds, in the right place it will explode.
I believe 100 perks would be enough for it.