While I do display PC defenses on cards, my group has the same issue with conditional modifiers. I kind of wish players would not pick feats/traits/powers which boost defenses because of the tracking headache, but I'm not going to dictate to players how to make their characters.
Some of that is hard-baked into the classes- like the Warlock's Shadow Walk ability. But the rest? I mean, damn near every power worth taking for some classes toss off conditional modifiers...and not just for PCs, either. Many do so for foes, too.
...8-minute turns is *way* longer than what other groups experience. So there's definitely something "unique" to my group going on.
We take longer, up to twice as long. Part of that is due to the size of our group, but not all.