If you want efficient, then run a low dwell. Set it about 9ms and you should be good. You may need to readjust your regs though.
Etek 3LT grey/black f/s
Valken Proton greyish/black f/s
68 4500 PE stubby, LP output f/s
68 4500 AIR tank(no reg) f/s
Creed/demon eyes f/s