Anyways feels like something is missing here.
I mean, I've read on other pages about the % system regarding 8.7m guards, but it I haven't face a normal hp guard in days, and spawning a guard each 2 hours should at least give me 1 normal boss each 1 or 2 days, 3 maybe. But nothing until now (maybe I just had bad luck).

But the main reason I think Nutaku still haven't finished their revision of the system, is the fact that they haven't published any official info about that (as far as I know).

I'm more convinced now that we should try the coordinated group raids. Having just 4 players with a little more than 100k SED plus slayer cards bonus, gives us 2 full focus strikes and 4 weak strikes within the time we have for taking Kasumi down. Adding some help from random normal players should do the trick.
For example I have only 110k SED, but plus slayer cards bonus I can land a 232K strike and almost 93k with 4 weak strikes (wost case scenario, being 10% all of those weak strikes). Since most of players at this forum have higher SED than me, the numbers get better.

This strategy requires the use of a sexual energy drink, though, so that's the reason I say we can rotate the player who spawns the guard.