Asking the impossible? (build questions)
Staff ele is probably the most viable PvE build you can have, right up there with GS warrior. I did zerker staff ele from level 1-80. It taught me how to kite, how to dodge properly, and how to use my abilities in consistent rotations to get combos.
The thing with this game is that zerker is and always will be (unless condis get buffed even more) the best stat combo. While staff has less defensive options than focus, you can still kite mobs easily using water 4, earth 4 and 4, and air 3 and 5. Against trash mobs, just LoS them around a corner, pop glyph of storms in earth, then spam lava font until everything is dead. Staff is viable for soloing, I can solo arah with it (though prefer to use d/f for more dps and survivability)
In solo PVE you can always use conjured weapons to make up for what your main weapon lacks if you need it.