Zappers not sure is a problem... my suggestion
I don't seem to have a problem with this, even tho i do hear complaints from members in my clan about it. Maybe this is because i earn and spend my DE so fast, there is only a small window in witch zapping is even some what profitable.
My suggestion:
I don't want any extra buildings or to increase hit points, but maybe it would make sense if Teslas could ground lighting strikes or absorb some of the damage from lighting strikes that land with in there effective range. Would still need to have full effect on troops and one shot building like hero beds, builder hut ect.