First of all you could definitely get a huge upgrade from crafting dexbracers. I would suggest changing your echoing fury for something else. EF is mostly used when dual-wielding since it gives attackspeed to both of your weapons (giving an extra dps boost beyong the 15% Attack speed increase for dual-wielding).
Keep crafting ilvl 63 (focus on bracers and if you got some mats and money to blow go for vit gloves). Also try finding a better weapon than EF.
You could simulate a weapon on D3UP and look what is required on a weapon to give you a small dps boost. But if you can't find anything within your price range then you could just keep using the EF.
You have alot of crit chance so a weapon with crit damage and socket to put an emerald in should be a dps increase even though the weapon dps is lower. I saw that you tried out a Butcher's sickle. It's a pretty good option since it comes with lifesteal and CD. Yours is good.
570k eHP should be fine for mp5 on hardcore. Using only single lifesteal with "lower" dps could be an issue every now and then but i wouldnt spend any gold atm on anything if you are fine with the way you can play/farm. In terms of spec i would change dashing strike/quicksliver for boh. Imo its more valueble to have some sort of teleportskill then the small heal and 15% damage. But thats just me.