Jon, if it works for you then it's the right AB.
These starter brushes, no matter who they are made by are not designed for fine detail work.
However if you're looking at a brush for this sort of work you might want to look at something from Badger, Paasche or Iwata. It, will cost a bit more than $20 but the results will be incomparable.
Have a look at www.dixieart.com to get an idea of what's out there.
Karl