Kog's double attack speed should be his Innate
Seeing Jhin's Innate only me made all the more certain of this.
Without a doubt the attack speed portion. Maybe the %HP portion.
Removing his self destruct would open up a nice little chunk of kit power to spread around elsewhere. If Koggy is supposed to be the immobile single-target sustained damage ADC, then his sustained damage should actually be, y'know, sustained. Not coming in spurts of 6 seconds with 7 seconds of uselessness.