I used to play a poison nec as my main PvP character back in 2005 or so. He was one of the best on West but it was harder to tell back then. I have to say that this is a neat nec but, there are a couple changes I would make to increase his versatility. 125% fcr is not necessary but can be useful in duels against other casters. Also remember that death's gloves are your iron heel. They will reduce novas to 1/4 of their duration and thus reduce your damage if you are not able to cast a new one within .5 of a second. This is where fcr becomes important for things outside of teleport. If you want pure damage, obviously the best way to go is actually bramble and 3 piece trangs (gloves belt shield) for the -25% enemy poison resists. I think a good poison Nec is one that balances damage, resists, dr, sorb, life, fcr and gear swaps. I think going for a spirit monarch. It will allow you more life charms instead of fhr ones, give you 22 more vita, more resists, and 5% more fcr for the minimal cost of 1 skill point and 1 facet. This is 4x 40 life gcs lets say and 1x 20 life sc, which adds up to 180-200 life before bo depending on how good the lifers you get are. Your helm is great but a +3 poison +100 life one would have been better if you use spirit since you get the 75% break-point even without it. This also allows you to use a CoA as an alternative to ber'd ss while not sacrificing any fhr. I would also have a 20% fcr nec ammy on switch for fighting other poison necs. Against them it's better to have that 75% reduced poison durration and 50% poison res from Death's hands. The 20% fcr amy is your sorb swap. If you need to get rid of the gloves to fight poison, you put on the amulet. If you need to introduce sorb rings, you swap the amulets too. It's just a good versatile thing for playing other characters.
Otherwise your necro is great. Very nice damage I would imagine, and res/ life. The only thing he would get reked by would be a physical damage dealer with death's gloves and carrion rings.