I'm supposing you're talking to me, since those are my chassis

No, the profiles don't make that much of a difference. It's the compounds. They are the difference. The rear tires on my JRXS-R (the one to the right, in the first pic) are of a harder compound than the front wheels, which make it drift like it's halfway between a 50/50 and CS chassis. An interesting combination, but works quite well.