Thanks for the reply, I'd given up hope of a response.
Fortunately I have a CRT projector (Sony 1272qm) which can display almost any analog signal.
Before the custom resolution firmware, I tested Pal 720p and 1080i, at 60Hz. Both were jerky but 1080i was the worst of the two. It's not your projectors fault.
Now, I use a custom 720p @50Hz, which is great, but I like the idea of reducing the stress on the projector by using 1080i @50Hz.
You'd think the brains at Momitsu would pull their finger out.
P.S. Van Dieman was a dutch explorer wasn't he?