One thing that may help (though as mentioned earlier in the thread, it is hard to offer advice w/out seeing what and where the issues may be) is strengthening your neck muscles.
One thing that I recommend to new folks (in jujutsu, not Daito Ryu, so it may be different) is that they spend time every day lying flat, holding the head aloft (tucking your chin initially, then, after you can do that for 5+ minutes, just let it 'hang' 3 - 4 inches above the floor) while goofing-off. It is the way I justify watching TV sometimes.
Jigme Chobang Daniels
aoikoyamakan at gmail dot com