What jumped out at me immediately is that you have fruit in the morning and veggies for lunch. You have zero protein until you "sometimes" get some peanut butter for an afternoon snack. And you have very little in the way of healthy fats except for the PB.
So I don't know what's fueling your body from the morning until that mid-afternoon snack, but it's pretty much nothing. Yes, you get some chicken at night and a couple of pieces of cheese once in a while late in the day. So what's happening is that your metabolism has slowed down so much because your body thinks it is starving. It's an evolutionary response that got our ancestors through famine.
You've GOT to have protein (yogurt, for example, or a GOOD protein shake, not the garbage in the "health" aisle, but something balanced), and healthy fats (olive oil, avocado, nuts, legumes, etc.). And much earlier in the day. If you had oatmeal with a handful of frozen berries (very nutritious because they are flash-frozen in season), or other fresh fruit on it, and some walnuts or almonds in it (and that doesn't mean to get flavored instant oatmeal in the package), and just 4 ounces of yogurt or a scrambled egg, you'd do a lot better. (I see the note below about making a big pot of oatmeal and leaving it overnight. Doesn't that cause food poisoning? Am I missing something there?)
The zero calories dressing isn't helping you - it's probably got aspartame or other chemical sweetener in it. Substitute 1/2 tablespoon of good olive oil and some wine or cider vinegar, and throw in some herbs if you feel like it. And put a half of an avocado on it.
Put a few almonds on that salad, and have a bunch in your desk drawer - 12 whole almonds at 10 AM will make a huge difference for you.
There is NO reason for 80 ounces of water. If you're exercising a lot or just generally thirsty (and there's no underlying problem like diabetes), maybe it's okay. You're drinking some caffeine, which dehydrates you, sure, so maybe you think you are making that up. Even the 64 ounce (8 glasses, 8 ounces each) was a made-up amount that no nutritionists today can really find any evidence to support. I'm not saying not to drink water, but if you are getting the "I'm full" feeling and it's not from food, you may be deceiving yourself.
I think that's why you're not getting anywhere - your body has no fuel to burn, and fueling those large muscles is what makes a difference.