Another buffered version may work such as calcium may work.
Id say get both get sodium and use maybe a gram of that daily and get another version maybe esterfied or a sorbic acid and use a gram or two of that. And if your able to up the sodium to up to 3 grams then do it gradually.
Would be a good boost for you id imagine and its only a matter of time before i see more results i reckon.
P.S Liv52 has been helping digestion abit with no sides.