Thing to remember about the B-29 is that it is a huge plane, and actually is a little under powered for its size. You have to remember to climb the ladder in the climb. You have to climb her in stages. Climb 1,500 feet at a time. then level off and speed up again and then climb another 1,500 to 2,000 feet.
Take-off, when loaded is gong to eat almost 10,000 feet....takes a lot to get that big bitch moving down the strip.
Now when you are cruising to target, you need to remember the plane isn't going to hold at a level altitude, you are going to drop a bit, but just climb her back up....
Remember she is a truck.......a bomb truck and that load of fuel and bombs is going to make her monster to handle until you drop that weight...