yeh sprog wants to learn static backwheel gaps. Just watch damon watson "simple edit" on youtube.....the big up gap on the pitbull, look at his technique
shorter stem = shorter feel to bike, although harder to lift front end due to less leverage...... er, shorter bars should help you pull it up; and a higher front end always helps, more stem stackers, higher rise stem, higher rise bars etc
i run a 2 bolt on the back of my zenith ( although the brake area of that is basically a cnc-d lump )and im more than happy with it. Had a 4-bolt on the zoo pitbull, and that was fine also...depends on which booster you go for, and on which frame. I'd say only really flexy frame need a 4 bolt booster, although the use of an aftermarket lever blade (read : longer / more braking force ) may facilitate the need for a stiffer braking area, and therefore booster.