3 link with a Y upper

[BillyShope]

I've noticed with a centered 3 link rear, on right hand turn exit, there is a greater loss of rear traction compared to left hand turns.

Yes, I'd expect this. In the first case, the driveshaft torque effect is added to the unloading due to the turn; in the second case, it's being subtracted.

But if I were to make the 3 link Asymmetric would the car lean more in left hand turns?

It might be better to ask: Would asymmetry provide more reliable and repeatable curve exit performance? And, the answer is "yes." With asymmetry that provides 100% cancellation (that's 100% cancellation, NOT 100% antisquat), the car would exit a left turn curve the same as a right. This is, of course, why Jaguar used it on the C-Type.
http://www.racetec.cc/shope

[-DA]

So, under braking you no longer need to dynamically counter driveshaft torque and, like you said Billy, each rear brake will get equal braking torques. But for some reason I'm still thinking the asymmetry would induce a brake steer issue. ?? I must be over thinking this...

If it were an issue though, a fourth sliding-link could be beneficial. Place it symmetrically on driver side with the capability to lengthen but not compress. During acceleration it does nothing as the upper links are in tension; however, once the brakes are applied the link goes into compression and prevents any asymmetric braking issues. Quite possibly a great solution to a problem that doesn't exist though.

[BillyShope]

I must be over thinking this...

Consider a free body diagram of the entire car and it should become obvious.

Quite possibly a great solution to a problem that doesn't exist though.

The Ramchargers organization was originally composed of engineers and technicians. Each of the two groups was necessary for success. The engineers made sure F still equaled Ma and the technicians were around to remind us that it's "lefty-loosey" and "righty-tighty." But, at times, problems arose. This was the case when some of we engineers proposed the asymmetric 3link. There were those who thought the car would certainly make an abrupt turn with brake application. So, we ended up with 4 links, the upper left being exactly as you describe it.
http://www.racetec.cc/shope