I don't really agree with that... under stress, unless you are just Mr Cool and Collected, you would revert to your lowest form of training. As a 3rd Degree myself, if I was attacked, I would not break out in high blocks and twist kicks... I would revert back to Basic Survival Mode... gross motor skill punches, kicks, and defensive techniques. Granted, the techniques I have learned over the last 11 years would come out (like the ability to kick properly, other empty-handed strikes, blocks and strike avoidance) but Bruce Lee I am not.
I think I alluded to this before here... when you are faced with an adversary, and the adrenaline dump, you lose your fine motor skills. Exact foot placement, precise hand strikes, and even weapon use... is gone. Auditory exclusion, tunnel vision, and even the inability to speak or dial 911 on your phone... all take place.
In one of our FAST classes (full-on basic defensive technique class) I've see a guy disarm a bad guy... take his knife... and proceed to punch the guy 'senseless'... while holding the knife! When we reviewed the video he saw what he did and commented that he didn't even remember taking the knife away from him, let alone that it was in his hand while punching the assailant.
OP, I agree... talk with your KM instructor and let him know you are having problems with the application of technique, particularly in multiple assailant exercises. If you are having to think about what you are doing, while you are doing it, then you are going too fast. That is not to say you shouldn't be challenged, but there is a point where instruction and learning will break down and becomes non beneficial.
I will also say there will be a plateau in training... you will get to a point where it all seems like French to you, and then, hopefully, one day *bam* it will all start flowing together. A good instructor will recognize this, and a dedicated student will work through that point, but together...