Multiply by 7/8.
Just to give an idea of the bossing DPS of an Evan, I'll compare to Paralyze and Chain Lightning.
Paralyze: 210 BA / 0.8 sec = 263 BA/sec
Blaze: 320 BA / 1.32 sec = 242 BA/sec
CL: 180 BA / 0.78 sec = 231 BA/sec
Illusion: 480 BA / 2.43 sec = 198 BA/sec
Ghost Lettering: 350 / 2.16 sec = 162 BA/sec
Killing Wing: 310 / 1.92 sec = 161 BA/sec
All of these are without Booster, so they'll be the same ratio with Booster.
None of an Evan's attacks beats Paralyze, and Paralyze isn't exactly the king of DPS, so attacking isn't looking very good for these Evans.
Edit: However, I've neglected critical and any other self buffs in this calculation. I might do it later.
Just to give an idea of the bossing DPS of an Evan, I'll compare to Paralyze and Chain Lightning.
Paralyze: 210 BA / 0.8 sec = 263 BA/sec
Blaze: 320 BA / 1.32 sec = 242 BA/sec
CL: 180 BA / 0.78 sec = 231 BA/sec
Illusion: 480 BA / 2.43 sec = 198 BA/sec
Ghost Lettering: 350 / 2.16 sec = 162 BA/sec
Killing Wing: 310 / 1.92 sec = 161 BA/sec
All of these are without Booster, so they'll be the same ratio with Booster.
None of an Evan's attacks beats Paralyze, and Paralyze isn't exactly the king of DPS, so attacking isn't looking very good for these Evans.
Edit: However, I've neglected critical and any other self buffs in this calculation. I might do it later.