March Excavator Mining Drone yield nerf

Skill bonus:
Mining Drone Operation: 25%
Mining Drone Specialization: 10%
Drone Interfacing: 50%
Industrial Command Ships (Rorqual hull bonus): 50%

Industrial Core II: 500%
Capital Drone Mining Augmentor II: 15%

Actual yield formula: base * bonus1 * bonus2....
(So if you just have Mining Drone Operation I it would be base * 1.05)

Pre-nerf:
Base yield: 220m3 (per 90 seconds)
Optimal yield per drone (per cycle): 5400.76m3
Optimal yield per drone (per minute): 3600.51m3
Optimal yield per Rorqual (per cycle): 27003.80m3
Optimal yield per Rorqual (per minute): 18002.53m3


Post nerf:
Base yield: 110m3 (per 60 seconds)
Optimal yield per drone (per minute): 2700.38m3
Optimal yield per Rorqual (per minute): 13501.90m3

13500 / 18000 = 0.75

You lose 25% of your current optimal yield, not taking extra drone travel into account