I meant to send this image earlier. Some of bloodsong theory is inside. If you think is is close to what you want, playing around more should get you there. There are small values of point light in the outer neon wordings and they are all set to full fuzzy. The red area of the word has a small % of transparency. Having a directional light on it give different result but this image does not. I think if you add bloodsong.."if you duplicate your neon shape and size it up, puff it up... and stack a couple fuzzy-additive materialed copies of it over your lights,"...it may yield better result. Good luck :)