Have you thought of an evening IF? When I attempt IF in a couple months, that's what I'm going to try. I grew up eating breakfast and I feel faint without it. I'm not giving it up. But I found that if I have a bigger lunch, I often forget about dinner.
You might also think about working in Bulletproof Coffee as a snack. It fills you up, but it has a lot of fat calories.
(the jury is still out as to whether women need to count calories in addition to carbs.)
5'0" female, 44 years old. Started Primal October 31, 2011, at a skinny fat 111.5 lbs. Low weight: 99.5 lb on a fast. Gained back to 111 on sugar cheat. Currently fighting off sugar/candy cravings with bulletproof cocoa and a little rice.
I (try to) follow by-the-book primal as advocated by Mark Sisson, except for whey powder and a bit of cream. I advocate a two-month strict adjustment for newbies. But everybody is different and should tweak Primal to their own needs.