Unfortunately CL builds are very mana hungry. The only way I was able to level up (currently 65 and just switched to arc lash, btw) was using the aspect that gives you mana back if CL hits yourself and the aspect that can proc additional chain lightnings. The first one really only works on single targets so bosses were easy to take down but I had issues with crowds unless I popped unstable currents.
Unfortunately CL builds are very mana hungry. The only way I was able to level up (currently 65 and just switched to arc lash, btw) was using the aspect that gives you mana back if CL hits yourself and the aspect that can proc additional chain lightnings. The first one really only works on single targets so bosses were easy to take down but I had issues with crowds unless I popped unstable currents.