What i dont understand is why so many use the NS with chain lightening. And not normal bolts. Listen to this..

LB=2 sec cast ( and since it has a longer cast time it can crit slightely higher then CL)
CL=1,5sec cast, but has a CD.

The main reason for me to have NS working with LB and not CL is of the CD( i dont want to be needing my NS, but CL have a CD.).
When it all starts you have a few secs to start a new heroisem, pick target, start nuking.
So if i intend to burst one down in the start, depending on gearing and setup, i will start with my CL+EM+trinket button as first nuke, basicly since it is faster and will hit before lets say warrior charges in. And then directly press my NS+LB button(ofc no CD this way so it will allways be rdy) and then i normaly also do a shock aswell just in case..

After that i normaly do 2 waves of LBs and then a shock or a chainlightening if they are on range, as an later alternative to NS.

I found this working really good for me.

So i basicly have 5 nuke buttons.

Butt1= Shocks (3 frost, 1 earth)
Butt2= Lightening bolts
Butt3= Elemental mastery + trinket + Chainlightening
Butt4= NS + Lightening bolt.
Butt5= /castrandom lightening bolt, purge, grounding totems (this is quite new, but it works fine if its to much going on and i jsut need the extra grounginds at all time - it will do groungings asap, purge if there is something to purge, or else just nuke basicly)