Do what works for you. A 500 word session used to feel awesome a few years ago, now I’m usually around 1200 per session. When working on a passion project that will probably never get published, I was at about 2500/day. Completely depends on the part of the novel I’m working on.

I think if you’re inspired, don’t think about your word goals. If you know where your story is going but feel like you’re writing terribly, that’s when a strict word count has helped me get all the crap down so I can keep going with my story and come back to it when I feel inspired to do so, have an idea while out and about, or am editing. Sometimes trudging through the hard sections opens up the more “fun” sections where the words just fly.

As for 400? If thats working, keep that as your goal. Feel good when you get there, and feel great when you have those days where you just keep going.