I generally suggest patience with early recovery symptoms, but in your case, it sounds suspiciously as if your wrap isn't doing the job. A barium swallow would be a non-invasive way to get some idea of what's going on. If you're not getting satisfaction from your GI/surgeon, it might be time for a second opinion.
The reflux symptoms can sometimes be caused by food sticking at the wrap site, but your description of being able to eat without fully chewing foods at three weeks sounds very unlike what happens at that stage of recovery.
Good luck getting to the bottom of all this!
Nissen Fundoplication 2/09
"Whatever you fight, you strengthen, and what you resist, persists.”
“Worry pretends to be necessary but serves no useful purpose”
“Accept - then act. Whatever the present moment contains, accept it as if you had chosen it. Always work with it, not against it.”