Dear Devon Guy,
I wish you all the best for your upcoming surgery. I too get acid reflux and have a sliding hernia, and take maximum dose of Omeprazole and Domoperidone. My Gastro did consider surgery, but decided against it because of my EDS.
Everyone's case is different though, and I am sure you have made an informed decision based on all the pros and cons for the procedure.
I don't know too much about the Fundoplication, but I am aware of a couple of people who have had it - one of the Moderators on the EDS Support Group website and also the daughter of one of the members on the EDS message boards.
If you have not already done so, it might be worth asking on the EDS site to see if anyone can give you some more info from a first hand perspective.
I really hope that this surgery will be successful for you