poamgosmoke - I use pretty much nothing but AN because it's just the best stuff I've ever used (and not because I've never used anything else). I always recommend it to anyone that asks. IMO, it's always the best choice.
Yes, you have to be cautious with the concentration you mix up - that's true of every single nutrient and every single manufacturer. There's probably some truth to the angry statement that the nutrient people put those numbers as big as possible because they want you to buy as much as you can, but at the same time if all you ever do is barbecue your plants with nutes until they're dead, you're not going to keep buying their stuff, are you?
IMO, the reason you ought to mix weaker is simple: You ALWAYS err on the side of being too weak because you can always add more. It's impossible to get nutrients out of water once you put them in (at best you can just add more water to dilute it, if you have the room for more water.) But anyway, underfeeding is easier to fix than nutrient burn.
Different strains use different amounts of nutes. I just figure the manufacturers are using some super-hungry strains to determine their recommended dosage. Start off light, dial it up till the plants are full, it's pretty easy once you get the hang of it.
vantheman - Your plants look decently healthy to me. You probably ought to ask questions like this in your own thread rather than hijacking someone else's, though.
Your plants are definitely big enough to need feeding, but whether you've got enough in your soil or not is hard to say. Personally, I'd probably mix up a very light dose like you said and try that to see how it goes. Keep it light so that if you do burn them a bit it won't be bad. Honestly though, only one of your plants looked like it might need a bit more to eat to me.