Hey, I'm quite interested in helping you troubleshoot this one. I'm trying to specialized in this and can use the problem solving Experience.
i Am using all 5.5 in my lab, it's a physical lab, not nested. I will need to have a look as I was rebiulding some of it to try and slipstream vshield into my images and I left it about a month ago, so I just need to book mark where it is and have a look. I have not seen the problems you describe yet. I will probably need some more info and wil let you know as soon as I am ready to troubleshoot what I need. Might have some time free this afternoon if I get lucky and will be in touch