What's wrong with my Reaper?

I am just no good at melee builds, so I appeal to all in the forum to help me with this one – a cold/vitality reaper.

https://www.grimtools.com/calc/62aOxM3Z

I have no large amount of end-game mythical, MI or what; everything I have so far is self-found. Right now I am at the Rotting Croplands, and in Veteran being surrounded means my HP drops to half in a few seconds until I hit healing.

Is it because I have poor equipment? Bad synergy between Reaping Strike and Blast Burst? Should I put more into defense?

Any help will be appreciated.

Your build is a spellbreaker not a reaper.

If you are interested in a SS reaper maybe this can be of help:
http://www.grimdawn.com/forums/showthread.php?t=68129

Not to self to ask for the build to be posted in the compendium, I keep forgetting

I must have posted the wrong link to my grimtool:
https://www.grimtools.com/calc/62aOxM3Z

Thank you for your build;One question, what skills will you recommend at the beginning levels, from level 30 to 50?