I've uploaded a new video to my YouTube channel explaining some of the tips and techniques I've picked up over the last few years imaging from heavily light-polluted skies in the Washington DC area.
If you're struggling with getting decent images from a Bortle 7 - 9 sky, check it out. I talk about a few fundamental acquisition techniques that help minimize light pollution's effects on your sub-exposures, followed by a couple of tips in Pixinsight that can help minimize and remove LP gradients. Here's the video: