In all seriousness in case TP-Link wants to be taken seriously in terms of providing actual support, alleged company staff might at least try to start abiding to some simple rules, as not using the expression "dude" in these forums...Just stating the obvious, not that I'm expecting anything to change anytime soon.
On to the issue on which indeed there's not much to go with - I'd personaly use the CPE510 for the AP and the CPE610 for the CL since when setup the other way around I did face rather strange behaviors in managing better rates than between two CPE510s.