Amost Any of your controls from Elec is worth getting. However, since you're going to be running in a group for the most part from the sound of it, Jolting Chains, and your single target Immob are probably your least useful abilities from the set. There are good uses for everything else. As far as End Mod, I'd only worry about slotting it into the Conductive Aura toggle.
On the Storm side of things, mainly be mindful of the knockbacks. You probably won't use Gale much except in emergencies. Hurricane can be good for herding and is good for emergencies, but won't be something up constantly. Steamy Mist is great for a group, since it not only provides stealth, but also some Def and Res. Freezing Rain is a great debuff, with a very good KD chance. Your AoE Immob is good to drop immediately before Freezing Rain, since it'll keep the mobs stuck inside it. I'm not sure what you have for healing in your group, but 02 Boost is a decent spot heal when needed.
If you get up to higher levels, be careful with Tornado. It has a decent damage output, but the KB can really mess with mob grouping. Basically just use it on mobs that can't be KB'd. This power is the big reason why Elec's ST Immob should still be considered, since it contains KB protection. With it, you can lock a mob down, and Tornado can go to town. I wouldn't recommend using Tornado when there's more than one mob, since it will just cause pure chaos. (Unless that's what you want)