Keep it up with the DGL and you are definitely doing it correctly. That is how I took them and I cured myself.
You should try the DGL again. I don't think that you tried it for a long enough time. Remember, it took ONE MONTH for me to heal and I only had GERD symptoms for ONE MONTH before that!!
If you want to chew them, put one at a time in your mouth and chew until it's very very small and then swallow. Don't just chew and swallow, that will not coat the esophagus.
What brand are you taking? The ones I got from Puritan Pride were dissolvable in the mouth with saliva. Maybe you should change brands.