I'd say 4 ounces is a small estimate, but good to guess low, then you won't be disappointed. I'd think more like 7 oz or something.
And regarding flush, I never feel like I've flushed long enough. Personally I don't see the point in packing the nutes at the end, or giving them any really. As long as they are still green, they should have enough to get them to the end. If it were my grow I'd flush now, with water and zone (or whatever you are using on the GH side). I'd also be really happy if it were my grow... because I just came down with a case of powdery mildew which is causing me to chop early, which makes me sad.
Get ready for how much trimming sucks, lol. It's totally fun for about an hour... then sucks for hours and hours after that. Get some spring loaded scissors, a must have. I feel like we already went through this so sorry if I'm repeating myself. A tiny dab of olive oil, or veg oil will take sticky off your hands, or you can use gloves like some people do. I also use a little head lamp thingy, to help illuminate the subject.
Can't wait to see what they look like. Got any new pics?