Scaling? with what? In old good 2.0 there was scaling with STR. SE get rid of that for some reason. I doubt there will be more than flat 20% reduction.

However making paladin to benefit from parry, rather than "oh no, block lost to parry again ._. shield swipe didnt proc" would be more than a good idea. Until it would simply be OP, dunno my pally is 57.

On the other side, offensive component may be bad idea. Melding parry for this offensive aspect? why not crit or det? it would have to be better than that. and anything better would be too much.