I did the the ABX regime for one year, my liver did never show any problems - buts its certaily true that has to be careful about side-effects, especially when long term therapy is intended.
But Inf and Cop do also have to be taken long term and also have side-effects.
I did know that the "30%" applies to relapse rate, not improvement.
As you wrote before you do not think that you did ever experience a relapse, what is the benefit you could hope for with Inf-b or Cop?
ABX, LDN and supplement arent a miracle cure, but I do really think its worth a try when looking at the alternatives.
In you case who would pay for the Inf / Cop? Health Insurance? Because non of them is approved for PPMS.
Treatment: Gilenya since 01/2011, CCSVI both IJV ballooned 09/2010, Tysabri stopped after 24 Infusions and positive JCV antibody test, after LDN, ABX Wheldon Regime for 1 year.