One question I have is how long have you been lifting? Obviously lifting 3-4 times/week will build muscle but it'll take some time to see in the mirror. Also remember to rest the muscle groups since that's when they're re-building. When you're lifting you're actively tearing them down so they need some time to rebuild and that's where you're going to see the results.
The diet seems farily on-point for what you're after. Also take into consideration what body type you have, if you have always been of a leaner frame and longer musculature then great gains in muscle size are really not all that practical vs. the frame of a more compact musculature/stockier framed guy.
Oh, this Twinkie thing, it ain't over yet. -Tallahassee