Best build atm is still genwuko (sunwuko + generator). This required The Flying Dragon.

You can build a DW Sunwuko setup too. It's not as good as using Daibo since you cannot benefit from the 20% damage in 2p Sunwuko, but the 3500% is still the best damage we have. Especially after the recent 2H patch, it is definitely better than DW. Slow attack speed is not really my thing too. With the proper skill (Siege the Initiative - 30%, Alacrity - 15%, Dashing Strike - Radiance 15%) you wont feel that slow. Things become very fun when FD proc as well.

If you still wanna go DW, you still can with Sunwuko, but limited to Holy element to further increase the damage of the proc.

If you must go with lightning build, you should go for Odyn Son + Thunderfury / WKL / SoH. Both weapon benefit from additional lightning damage. You should use Lightning rune Bell. It offers solid damage. Raiment of Thousand Storm should be the set you should aim for. It offers additional lightning damage and solid DS 3000% as lightning.