It probably appears you get hit harder because when you do, the % of your health drops a lot further. (10k to someone with 30k health is 33% whereas 10k to someone with 40k health is 25%).
But ya, what the guy above me said. Don't really worry about balancing your avoidance ratings, you'll get enough raw avoidance from gear for the most part. You've simply gotta be able to survive the big hits.
Change the gem in your pants to either 10agi/15stam or 10dodge/15 stam like the good fellow above me suggested. You have the 30stam/15 resil shoulder enchant, so you can actually drop down to 536 defense and still be uncrittable, so lose all the defense gems/enchants. 240 armor to gloves, 225 armor to cloak, 18 stam to shield, etc. Also, get rid of fervor of the frorstborne fast. Pick up either the glyph of indominability or heart of iron or brewfest trinkets if you got those and put those in that spot. Jug's vitality would be ideal if you have access to the 25 man normal version of that. I'd probably even use essence of gossimar against the fervor of the frostborne.
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