Did you even think this through? Giving 30-40% SI basically removes the droner from playing at all after they detonate an kami drone for 2 or more minutes.
They couldn't use any other drones, they would be slow, possibly now overloaded so can't relocate between drones. Wouldn't be able to use stealth either.
So what you've done is made the droner even more of a free kill than they usually are if they happen to use their strongest attack.