Roger,
I would tell you from experience that you will have more problems getting the action you want due to the fact that you use very light gauge strings. I say this because I use .40-.100 DRs, and they give me fits, regardless of bass (and I own Fenders, Gibsons, Rickenbackers, Peavey, Pedulla, and yes, Alembics). Why do I say this?
Most manufacturers (from what I understand, anyway) set their basses up with .45-.105 strings (four string basses). Their instruments are primarily designed with that in mind. I've found that if you go with heavier gauges, it's not much of a problem. However, if you go with lighter gauges, it is. I'm not sure of the reason, but I think it's just basic physics. The simple fact is that if you use lighter gauges, there simply isn't enough tension in the string to pull the neck forward, and hence, the strings have nowhere else to go but against the frets, causing buzz. I know this since I've had trouble getting the Essence I have here in Iraq to behave. I attribute some of this due to the weather here (it can be extremely hot and humid, and when it rains, it cools considerably), but also to the fact that I use light gauge strings. This has also been my experience in the U.S., in North Carolina, where the temperature can be both humid and hot, as well as cool when it rains.
As I understand it, you like an Entwistle type action on your instruments, e.g., very low. For this type of set up to work, a light touch is a must. I know I'm not telling you anything you don't know already, but mention it only because I've experienced the same problem. I tend to put my right hand closer to the bridge, and I tend also to dig in quite a bit. I find that placing my hand here mitigates the buzzing of the strings simply because the tension is greater, and there is less tendency for the string to vibrate against the frets, causing buzz. When I move my right hand closer to the neck, just the opposite is true; the string begins hitting the frets due to the lowered string tension, and has more of a tendency to buzz. However, this can be useful. Stanley Clarke does just this, and he gets some really neat tones out of his instruments.
What I'd recommend is following Joey's method - quite simply put, it works. You will need feeler gauges and a capo at a minimum; a ruler or string height gauge are useful as well. I bought my feeler gauges at a hardware store, but you can also buy them at
www.stew-mac.com. Same goes for the string height gauge. Also, Dan Erlewine has some great books and DVDs on the subject of guitar repair and setup; I got the DVDs, and they are a godsend. Also available via Stew-Mac.
You will, as others have noted, have to give the neck time to adjust after making your changes. The advice about letting it sit a day or two is a good one, and it works. Again, this has been my experience with all my basses, regardless of marque.
I hope you can get things right and get the DW playing the way you want it. Let us know how it goes, and best of luck.
Best regards,
Alan