Well, I dont mean to decent, but soul reaping is nothing close to energy storage capacity. It works great for sucking energy from the death of others around you but does nothing for energy reserves, as such.
I ahve found that, for me, tattoos are crucial. We (necros) seem to ahve our own special flair; ie AtB, SV, ECHO, SS, SS, SUFFERING or whatever combo we use. For me and the combo I use, the small amount of extra energy combined wiht my primary/off hand or staff made the difference. I was able to get my casting to the second wiht recharge and such with the dorks tattoo set.
Others may not find this to be thew case for their setup, as we all play different styles. And in saying this, I dunno if my experience wiht this will help you figure your issue. I would think that getting your combo and weapon setup down will dictate wether you need the tattoo energy or not.
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