As you probably know his MELD score is based only on several lab test results Bilirubin, Serum Creatinine, INR and Serum Sodium.
It sounds like your father is suffering from portal hypertension even though his other liver disease indicators are in lower range then the severity of his symptoms imply.
Have you spoken to his doctors about his situation and what they suggest? Why is he not eligible for a transplant. Could he also take beta blockers for the varicies? Is he taking a duretic to help reduce the ascities? Is he taking lactulose for his HE?
Unfortunately in ESLD there is not much to be done except treat symptoms and wait for a liver transplant. Even those on the list may die waiting for transplant. There are about 6,000 patients on the list at any given time and only about 1,600 transplants done annually due to not enough organs available.
What have his doctors told you?