I made a review:
the difference trying to maximize avoidance and dps is that talking about dps we have to consider the glyph of hold line.
without it the best solution is to maximize avoidance: the swing reduction of the parry is sightly worse than a crit increase, if i crit 1 more shield slam i make 600k more dmg and 1 more revenge crit is 300k more dmg, etc!
with that glyph, it's sure that parry is better, but the new question is how much? 3-4-5-10-20 % ? i'll investigate to take the exact value in this week