I did a 3mio dummy parse yesterday. Let us compare it to a lighnting parse with almost same gear.
Lighnting BD with 76 more BAP than I have (2339 - 2263), ET 8 set (I only have ET 5): 3,87 mio dps
ET8: 100 + 30 + 35 = 165
ET5/TT3: 100 + 30 + 20 = 150
-> 165/150 = 1,10 -> 10% more F damage -> 10% of 80% -> 8% more overall damage
4 f/s is possible https://cdn.discordapp.com/attachments/328672771322281986/596485775189737492/unknown.png
3,46 f/s in my parse -> 4/3,46 -> 1,16 -> 16% of 80% -> 12,49% more overall damage
-> 3mio * 1,08 * 1,1249 = 3,64 mio
I did not use a dumpling (+ 2%?) -> 3,71
3,87/3,71 = 104,3%
4,3% more damage with 76 more BAP.