Uhm, for starters, don't only use one skill with Zane? His skills are designed so you use two of them at once. How did you reach the end game and still only use one of them, and then the shield?
Exclusiviely using the shield and then wondering why your experience is miserable is really, really weird tbh.
Most of his skills are synergizing with each other. It's not worth it to run grenades, especially after you got some legendary class mods. There is a killskill build where you try to use your skills as often as possible to activate every single killskill you have. The cryo build requires a bit more gear but you basically run around with your clone and shield activated 100% of the time. But you'd need to get a really good cryo weapon and skill the orange capstone.
Honestly sounds like you just didn't start with the right character. Only the shield...what on earth lol.
