I like head raises, but I notice better results when I do a moderately wieghted static shrug while doing head raises.
Also put a medicine ball under your forehead in pushup position and do "a head push" or forward bridgeing with your head off the medicine ball (Im not sure what people would call it)...Anyway bridging or forward push off the ball is Good for really putting a SAFE heavy load into the forward movement of your head and kneck as you can brace yourself with your hands in push up position and even add more tension by putting feet up or working from knees down.
Also you might notice a static balance off your head helps the fwd lateral areas of your kneck.
I personally don't think it's wise to roll the kneck to muchyou don't wanna mess your kneck up
Also I have some seat belt straps I've modified to connect to my cables so when hooked up to the high cables they make a perfect loop at the bottom
i can lay into it face down on a bench for forward kneck movement.