We all have to find our own path, here. For me, I use DWLZ often as a quick reference, especially when I don't have the time nor inclination nor my WW materials to figure it out. And really, the number at the end of the day is essentially an estimate even if you go by the restaurant NI -- unless they measure out the dressings/etc with a tablespoon instead of pouring it on, you won't really know the exact number, and unless they actually count out the olives, you just don't really know for sure EXACTLY what you are getting because the difficulty comes in when things are handmade. It is hard to standardize a slosh of dressing or a smudge of mayo or a handful of olives, and this is the crux of the food industry's issues with regards to nutritional labelling of restaurant foods.
It just depends on how OCD you choose to be!!! I personally have better things to do, so I estimate using my manual (it too varies from the nutritional info of the restaurant) because I personally don't believe alot of what the restaurant NI says in any event:
http://www.nrn.com/breakingNews.aspx?id=364150
and
http://www.allbusiness.com/retail-tr.../758888-1.html
"Nutritional facts listed on a restaurant's Web site or brochure are generally not completely accurate"
So it really is up to you whether or not you take the restaurant data as dogma, or go for an estimate from either the NI, or the Dining Out guide, or an online website. And in the grand scheme of things, if you have overestimated, you'll be fine. If you've underestimated, your Flex points will take care of it.
I think our OP did a great job of figuring things out, and deserves a WHOOT for that, no?
Kira