Necro Bone Knight - Upper Limit?

[zelld52]

I am doing a second necro, because necros are fun. My first necro, I drain-tanked with a Smoldering Brand (upgraded to Staff of Writhing around level 20) and a Tolapumj Robe.

It worked well up until around level 30-35. 30-35 I mostly fear-kited guards in WK / WC. Started charming at level 34, and flew to 60.

However - this time around - I want to try and drain-tank as long as possible. It's been 2 years, so I was able to give this Necro a bunch of STR, AC, DEX gear and a Velium Crystal Staff.

Close blues (1-3 levels lower) are rough. If I can't get a Lifetap off (CHANNELING SUCKS, THEY BROKE IT!!!): the fight gets a little hairy, and requires a bit of downtime to recover.

I wonder, because I never went too far past 30 tanking - How much further can I go? I know some necros got all the way to 50 in classic by drain-tanking. (Vampiric Embrace OP)

Anyone done that? Or even cooler, gotten to 60 drain-tanking?