Problems gaining health back
Ok, first of all to really help you with your lifeforce gain I would need a skillbuild you are using or something. Most likely, the problem that most necromancers have, is that they use death shroud in 1 go, while it is much more effective to use deathshroud to eat your enemies burst when you are out of dodge/stunbreakers and go out of it directly after. Besides that having atleast spectral armour/walk/grasp on your utility bar helps lifeforce gaining alot. Also use your healskill before using deathshroud, so you can use the death shroud hp bar to help you reach your cooldown of your heal.
Far Shiverpeaks – Bubblegum Dragons [GUM]
The weapon set I use by far most in PvP is scepter/dagger and for a secondary set I usually bring staff for a rupt, chill, team condition removal and just some area control alothough I use the s/d set alot more. I dont usually bring ant LF traits but I often bring Signet of Undeath for the quick res. Feast of corruption on the scepter can be decent for gaining LF but it is just not enough.
In PvP I use deathshroud for the fear rupt, chill, waiting for my heal or condition removals to come of cd, soak up big attacks or just a panic button. I like to think I don’t use deathshroud in the way you mentioned and I have seen so many do.
Before Blood is Power got changed I always brought it for PvP because it was great at keeping my LF up (I still use it quite alot for the might though but I liked it better before).
I never really use spectral armor because of the ridiclous cd and spectral walk I mostly use for the swiftenss or teleport but I don’t really think it is worth sacrificing a utility slot for in most cases.
Like I said before, in PvE i generally don’t have problems keeping my LF up because of all the deaths around me and there I also use staff more than I do in PvP so that also helps.
As for gaining back health which is a bigger problem to me at the moment I just really think necros lack regenartion avalible to them making them surprisingly bad in sustained fights which are ment to be their speciality.
I think necros have the best heal in the game though, Consume Conditions, because it has a big heal, removes all condtions and has a short cooldown.
Switch to using staff as main instead of sceptre/dagger. U can trait for LF on marks trigger (20 points in Soul Reaping) and the staff has +LF on its auto attack; it also has a spammable regen to keep ur HP ticking over. The Spectral skills are great for gaining LF, but it seems to me that you’re relying a lot on your first spite minor trait which is fine for pve, but not (as you know) for pvp.