I know what you mean! I feel like each first draft I complete is longer than the last, and I find it motivating as well. I like seeing growth! For chapter length, it depends. If I'm writing for tapas it's about 1k words. For other stuff, it's usually closer to 2k.
Planning wise, I just go with the flow. I don't really try for a specific word count, but it usually works out anyway. Once I get a feel for how long a chapter should be it becomes almost subconscious for me to write that much.