Its all conjecture at this point. Once we get past the initial "B29 burn-in tour" (no pun intended) then threads like this will have more real data (in game) to chew on. Bottom line for me is if some guy wants to take his B29s to 25k+ then I am simply going to find other things to do with my time online besides grab to 25+ and try to position myself above, to the sides, or in front of him for a one shot pass. Of course, same can be said for Lancs, B24s, and 17s.......
As far as the 262 goes, in the hands of a experienced AH gamer with plenty of grab time on his/her hands, B29s will be going down in flames, one way or another. Regarding the 163, its going to take a pretty direct route over one of the rear fields and even then, if the 29s are high enough, the 163 is going to have little loiter time to set up decent attacks. Not too much of a threat there but again, time will tell.