Hello there.
Unfortunately, those functions from YEP_ExtraParamFormula do not work with block or parry at this time. Block itself was actually causing a crash when used with that plugin specifically because of an issue with it where it wasn't expecting there to be more than 10 xparams in the first place, and didn't define default values for xparam(10), which caused crashes on load when it tried to read paramPlus values and such for that eleventh xparam.
Technically if the yanfly plugin had not made the assumption that there were only ten xparams, adding something like this two it would just be a couple of extra lines defining a couple of new functions, and using their existing functions to make it happen. It could be doable without much trouble, but I think it's a bit outside of the scope of my plugin here though.
~Ramza