Placing the PSA on the opposite side of the thumb hole is likely putting it very far from your PAP. The further away you place the PSA, the less you take advantage of the Intermediate Differential potential of the core. As such, that COULD help you make a strong asym more controllable. However, as PSA-to-PAP distance is only one of three layout factors (pin-to-PAP distance and pin buffer being the other two), it's certainly no guarantee that you'd be getting what you want.
Since I've been drilling my own stuff, I've used Storm's Pin-Buffer Layout System as my guide, and I've found their layouts to perform as advertised. Therefore, it if were me, I'd suggest you use something like their 5x4x3 layout. That will likely be pin down, and it will place the PSA close to or on the VAL three inches from your PAP. They say that that layout produces good length, late midlane, is a control type of layout, and does well on low volume or wet/dry.
You could also consider a short-pin layout like 1.5x6x1. I've used that on a couple of stronger asyms (PhysiX and Gravity Evolve), and they are really, really good at offering control but not puking and hitting like crap.
However, your pin-to-PAP distance will have an impact on that too due to it determining the amount of flare you're going to get.