On Aaron's recommendation, I tied a bunch of smaller Vladi worms this weekend and discovered some ways to make them even better, in my opinion.
In general, I have found if you stop and think about every little step you do when you tie, you can often figure out a way to make it better. You don't have to follow anyone's opinion either (including mine), what works best for you may indeed be the best there is.
For the smaller worms:
(1) Use smaller diameter lead,
(2) Use a thinner strip of latex (~10 worms from one condom),
(3) Wrap only one layer of latex in the "neck" of the fly,
(4) Concentrate on getting a really nice taper,
(5) If you use the Daiichi 1870 hook, bend the point section of the hook to be parallel with the front part of the bend, and
(6) Most importantly, take the time to smooth the outer latex wraps as you go; all those little streaks and crinkles really take away from the fly's profile and sink rate.
If you look at a real expert's flies (like Davy's) you will notice there are no gaps in the profile, no unnecessary thread wraps and a refined, tapered profile. These little elements add up to a fly that sinks, tracks, wobbles and fishes correctly. I stand on the shoulders of giants, of course, having learned all these tidbits by watching and reading. Hope this advice is helpful to you too.