cruci necro tank build

[zeCook]

Hey guys,
since I have a golemancer and am trying to make a proper cruci tank from him I will need some advice.
Currently he is not strong enough for the higher levels (15 and above).

My current items are:
--Goka
--shrieking lich 3 to golem,max res,still no sockets (am planning to add 2 xer)
--purifying flames
--necro soj
--madness caster
--spider web
--storm circlet
--treads of val
--darkforce spawn shield *max
--enigma

--CTA and spirit on switch

--Necro torch,belials tome and anni
--full with summoning skillers

Currently using merc from act 2:
--infinity
--devils bargain
--eth steel carapace

Now,I can replace the amu with a nec mara,but what else should I try to improve? Any advice will be appreciated