Well remember, you can go 0 ccccc to do 5 chronoboosts in case you lag for a little while, but ya...doesn't seem to be a prob for me. Sorry. :/

As far as sentries, I tried keeping them in group 2, but I keep forgetting to press the damn tab button, so if Fs everything up for me. I usually have them in 3, though I'm contemplating putting them in 1, since they're as slow as my zealots / immortals, and it's not like my zealots or immortals have spells to cast. Plus, I always find that with my sentries near the back of my army, I don't force field as well as I'd like to, resulting sometimes in my FFs working AGAINST me (I usually skew to zealots more than most people).