Hi Lyco,
I think I did misread some things or use the incorrect terminology (plus I'm getting pretty forgetful these days!). At any rate, I think I was actually referring (at least in part) to the angle between the stem and peduncle that you mentioned in your post.
I haven't been able to relocate the photo I'd seen earlier, but I "rediscovered" this useful article with a table showing the differences between the vegetative vs generative forms, including the stem truss angles:
http://ag.arizona.edu/ceac/sites/ag....20tomatoes.pdf
Looking forward to seeing the photos of your greenhouse plants showing the truss (peduncle) to stem angle that you mentioned. In the meantime, I'll keep searching for the photo I referenced earlier.
Anne