If I remember correctly, the screen is 7x3 right? (3 squares wide, 7 squares long)
I can't check I'm at work, no videos.
Well if it's 7x3, it's probably 'cause you have 3 choices when you get a 3 kill streak, 3 choices when you get a 5 kill streak, 7, 11, etc.
Maybe you can only pick like 4, and there are some for levels let's say 3 5 7 9 11 and 13. The lvl 11 and lvl 13 ones are stronger (of course) but less people get there, and less often. Something like that. If you don't understand what I'm saying, tell me, I'll explain again.
Juggernaut was designed so that you survive take one more shot from any weapon.
Stopping Power was designed so that you would need to make one less hit with any firearm to score a kill. The game code literally cancels out the damage effects when Stopping Power or Sonic Boom hits a Juggernaut. No increase, no decrease. The damage perks are perfectly balanced against each other. If you use "a whole magazine" to kill one guy, it isn't because of Juggernaut. YOU JUST SUCK! Excuses excuses...