Have you had a go at making your own brushes yet?

Its pretty complicated because there are so many different settings, and they aren't particularly self explanatory, but I found that you get used to what everything does if you pay around long enough with them.

Think first of your ideal brush - shape, texture, how it reacts to pressure and tilt... then set about creating it.

I will go and have a look for all the vids I watched and bring you back a few links that might help