The max fuel screw only affects MPG at full throttle.
starwheel up for more spring tension. the allen on top of the LDA is an idle stop....where it starts in the no boost position
Ball and spring MBC even at a below stock setting will bring the boost up sooner, which helps keep smoke down.
Read these?
http://www.vwdiesel.net/forum/index.php?topic=645.0
http://www.vwdiesel.net/forum/index.php?topic=579.0