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Lol...
First of all, 150 dex won't nowhere bring you to max blockrate (Stat calculator says 60% with a +8 billst and maxed CR, when with 15 dex is 42%, and some rangers/blade go over the 90% blocks). Then, with a +8 +28 HP set and no awakes, will result in 11k hp. Why bothering in getting an half unreliable block rate, when you can put 80-100 STA, rest int, and aoe much more safely and fast (a 150 dex build results in less than 100 base int :\).
And for the damage taken, all you need to get the minimum damage (while having opposite element suit) is about ~1.4k def to aoe properly,and when hits will be at the minimum blocks wont reduce the damage in any case, so HP would be still better (DEF would only decrease crit damage). Whatsmore, you have preve, which makes you almost unkillable.