It's been a while since I did any logging, so I'll just stab at coherence here.
I have two tulpas, both ponies, Clair and Sophia. The former has been around for a little under eight months, the latter for about five. Closed and open eye visuals are both pretty clear, but can always be better, and both of them are able to possess, though Clair tends to dominate.
So we're currently working on strengthening possession and plan on skipping down the merry road toward switching. I've recently turned on to using grand strategy sims and letting Clair go to town on the European populace to get her into really thinking and acting without me over her shoulder, and getting away from what's going on. But I gotta admit it's hard to ignore a cute pone jailing a radical liberal for sedition against the monarchy. I also try to have them walk me or drive me around wherever possible.
Still working on imposition, too, which was our main focus before we were sidetracked by possession. But I'm still convinced there's nothing to help it besides more time spent visualizing and visualizing better, so I can't be bothered to rush it, and I doubt I'd be able to rush it.
Nonetheless, I've been trying to rush it, and I do a few things to help: Image streaming, Eye-Bo and lucid dreaming all stand out as having been really rewarding at some point or another. I haven't had anything like a regular forcing schedule since the end of August because the busy times are back, but these kinda visualization techniques will probably be my main focus, and especially image streaming because they can possess and tell me stories, killing two birds.
So I guess I'll aim for an hour a day to start, then add more as I begin to procrastinate on other things.