My guard has 19k mastery, 59% tact mit (12k), 20.1% crit (8.4k) and 10k morale. I think that's the best ballance you can get unbuffed. Given that we aren't a DPS class and although our base damage is good the only way to burn through creep mits + audacity is via crit. make sure you have a good amount of agility 450 ish + (700 agility = 0% miss chance) for if thou want to DPS your shiz need to land. Finesse should be 5k+, I run with 6k finesse on mah guard, can get it up to 7k without losing too much stuff.
Edit: Physical mit doesn't really matter. Creeps don't do physical damage, they either do tactical or common. The thing is physical mit adds to common mit, I think 8k physical mit is 60% common mit which is enough because low rank creeps don't do much damage, same goes for NPCs.
Your main priority is tact.
Courage and honor are the two greatest qualities of mind.
Aristotle
You have way too much morale imo. Try dumping your morale, get it down to 10k ish and get some more DPS, your crit is decent ( i like it being at 20% +) but your mastery and mits are really low. Try getting more mastery and some more mits, The jewellery i use are:
Earrings: Great river earring of might
Limlight Gorge Might Earring
Neck: Gregolin
Pocket item: This book that gives 95 vit, 672 crit and 681 mits
Bracelets: The great river crafted bracelets, I kinda like them cuz they give pretty much everything you need: Vit, might, crit, power
rings: Limlight gorge might ring
This ring from RoF that gives: 95 vit, 32 might, 169 morale, 1k finesse
Cloak: I use Cape of Unyielding Tide (I think that was the name). It gives 1k finesse, 122 vit and 61 might
Audacity gear: Helm, Chest, legs, gloves of the Sovereign's blade (Overpower) and the shoulders/boots that give tact mit
bow: Great river bow (+672 crit, + 568 mastery)
Relics: Dev relics, +25 vit + 658 crit gems, mastery runes and the might crafted relics.
Courage and honor are the two greatest qualities of mind.
Aristotle