Everyone has there nuances with techniques, so here are mine.
Fairly scruffy flat brush, not dipped in thinner first.
Matt surface on the model. I seem to find this minimises streaks, it sort of bites in better.
I use Tamiya acylics. For Panzer grey, I would do a medium drybrush with lighter version of the base, and then finish with deck tan. I use buff for warmer coloured models. I remove a lot of paint before i touch the model, and I start light.
I often use the stuff in the lid, because it gets a little thicker, which seems to help.
Good luck Larry!