think I solved it but not quite sure if this is the most efficient gem support setup
CoF - voltatic mark, lifetap, innervate, impetus
CoS - ball lightning, deceleration, energy retention, (impetus for bosses)
LA - martial tempo, ice bite, glaciation, inspiration, primal armament
Lrod - scattershot, conc effect, heft, close combat, longshot (not sure if that last one is ok here)
HoI - cold infusion, magnified effect, elemental focus, cold pen, cold mastery
orb of storm - chain, persistance, unleash, overabundance
HoT - lightning mastery, electrocute, neural overload, conduction, lightning infusion
wind dancer - blind