How does your throat chakra usually feel? When you focus your mind on it, do you get a sensation? If so, what is it like?
As for further activation, it may be that your body/soul is prompting you to do Kundalini Yoga, or perhaps subconsciously doing Kundalini movements to assist the energies moving.
Sometimes when energy is overwhelming, the body can move/shudder on it's own, or you may have a really strong urge to move a certain way or take a certain pose (which usually correlate to Yoga poses). When you feel that during meditation don't resist it, but try to go with it and follow your body. This helped me a few times.
I assume you do color meditation, chakra spinning, vibration, etc. Best thing to do is just to keep doing this. The chakra opens on it's own with more empowerment. Keep working on it and do not let such experiences distract you, these are signs that your efforts are paying off.
It is important to not let up on your practice, as you may lose the progress that got you here if you neglect your practice at this point.
Deliberately spinning the chakra very fast can help a lot with moving the energy and opening the chakra up more, also, moving the energy through the chakra, up and down can help as well.
Feel out if there are any blocks somewhere along the path of the shushumna and around the chakra by moving the energy. If you encounter resistance or stiffness, then there is a block.
Empowering the chakra and then focussing on moving the energy through the blocked area, visualizing the blockage clearing up and the pathway widening, is a good way to get through these.
If you don't already, use color while meditating. Visualize the energy of the throat chakra as vibrant sky blue while spinning it or breathing energy into it, or while moving the energy through the chakra.
Also, look at Lydia's post on yoga for the Throat chakra. It works wonders to combine her suggested yoga with your chakra meditation for chakra empowerment and especially further opening the chakra's.
Hail Satan!