Casper, You can't always test on Low level mobs. I did plenty of testing on both Turns 4 and 6, and my healers didn't notice any difference on 10 attempts with my 627 Parry set, vs another 10 with my 490 Parry set. I didn't even tell them until after the 20 runs for a blind test result, so they wouldn't be mystically creating anything.
Both with an identical Shield on.
So If you would like to re-test on level 50+ mobs in a Dungeon run, or keep running the same dungeon over and over again, and see how effective the stats are in real time, be my guest. I'm not seeing it personally, and the "1%" Damage increase is totally wrong, adding those Determination and Crit stats boosts me 25 DPS, which is over 15% more damage dealt. I think thats worth while.