B-spec "personalities"--best performance level?

Hey quick question:

I'm having a little trouble understanding the b-spec "personalities." No matter what personality I get they always seem to get really into the red (at any level) when they're in a pack and way in the blue when they're ahead, basically letting the pack catch back up to them.

So what is the point of the personalities? They don't seem to naturally have a tendency toward the level indicated when you start the character. They just all do the same thing.

My question is does this "personality" level between hot and cool indicate the level at which they best perform/get the quickest lap times? Just curious as otherwise I can't figure the freaking point of them.
 
Not true, my bob(cold as ice) performs much better when he's far in the red. Although that's only started happening in the last 10 levels though. beforehand he was spinning out in the red quite often.
 
I have noticed my slightly cool bob runs best at slightly hot and my slightly hot bob runs best at slightly cool. My raging hot BoB I haven't figured out because I haven't paid attention since I only use him for endurance when I just let them run without my input.
 
I have found my Bob acts totally differently after level 10 as they seem to get totally fearless.
 
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