Brian, best bet is to just bolt the pickup down onto the motor witht he screws about halfway along the adjustment slots, run it and see how you like it. If it seems boggy, advance the timing to the max amount possible and leave it alone after that.

The DA and 3W ignitions use an inductive coil pickup, that uses the passing magnet to generate an electrical "spike". The faster the magnet passes the coil, the sooner the "spike" occurs, and the more ignition advance you get. About the most "advance" you can get out of a design like this is in the neighborhood of 15-18 degrees, usually, simply because of the inherent limitations of the design. At idle, and "base" timing, you actually have about 10-15 degrees of advance and this increases to a maximum of about 25 degrees or so (depending on engine speed). This is perfectly adequate for most engines, and very little advantage will be found by going for more advance.

Your 3W had the magnet aligned to the pickup coil from the factory and the DA ignitions pickup is basically the same design. I'd put the ignition pickup directly over where the 3w pickup used to be, and leave it at that. I doubt you will get more power or performance by playing with the timing a lot, or by advancing it outside the range already set into the pickup coil assembly.

Hope this helps