1. I had problems getting GP3300's into my B4 with Deans 2.0 bars (supposedly the ones that will make it easier to fit). Which Deans bars are you using (2.0's or 3.0's)? I'm using Trinity bars now, and as long as you get the bar right up against the cell where you solder it, they fit easily.
2. I haven't heard of anyone putting bladders in AE shocks, but I have heard of people using the Yokomo shock caps with the bleed holes on AE shocks. I don't use any of that stuff, I just run the caps that come with them out of the box.