A real big part of making them look right is just selecting the right dubbing. When I pick out dubbing I like something with a bunch of guard hairs. So squirrel or a synthetic blend.
If you want to use a soft dubbing try it in a dubbing loop. When you go to put the dubbing in the loop, Pinch it tightly in your fingers and pull it out. This will orient the fibers in one direction. Lie the perpendicular to your waxed thread and just stick them in there till you have enough. Then pull your thread tight with no twist and trim to the length you want the body. Your scissors will have to have a nice edge for this to work
Dubbing a little looser than you normally would makes a difference.
Something else you might want to try is to pick all the dubbing out before you put the back on or rib it. the trick I have found here is to wiggle your rib back and forth when you wrap it forward. This will make it trap less hairs as you wrap forward.
Just a Trick with ostrich herl, when you tie in add a small piece of mono thread and twist the mono and herl together before you wrap it. This makes for a pretty durable fly.