the fact that you have kirin and your thunder is the weakest element make me believe that you have 100% eido for other element too. Which mean you not gonna invest your MT on BaalU which make your team can’t run shingen. So i would say Herc is ok for your thunder team because it gonna stay shit forever because you already miss so many UE weapon

As for healing opption for your thunder team. If i were you i will go fuck heal and run Cyclops instead of Gryla. But if you still want to use thunder for s o m e r e a s o n. Then Sol AW is a good opption. Adro is for supporting Warag