Thank you Sherwood. I agree with you in that now that all the bushes have been replaced I'm hoping it's a matter of basic adjustment (fine tuning if you will), and I think that was my question in my original post.
Let's hope I can get satisfactory results that way and not have to go down the road of a tranny rebuild.

Yep. Fine tuning, very slight adjustments here and there in directions opposite from the desired direction. It helps to start with reference marks on adjacent parts so you can return to a known start position if needed. The rubber surround under the carrier plate limits lever travel so proper adjustment occurs within a confined window. After an adjustment, the shift lever should be midway in the fore/aft direction (lever vertical) in Neutral so there's sufficient travel to fully engage 1-3-5 in the fore direction and 2-4-R in the aft direction.

For what it's worth, I have driven my brother's car with the Wevo shifter and a Wevo coupler. My car has the Seine gate shift kit and I have brass bushings in the coupler. My brother and I both think my less expensive setup feels every bit as good as his Wevo setup.

I agree with Cabmando on the couplers.

I've had both a Wevo coupler and a stock coupler with brass bushings.
I found them indistinguishable.

Can't comment on the shifter mechanisms - no experience with either.

Another discussion here:

http://forums.pelicanparts.com/porsche-911-technical-forum/945385-915-shifter-linkage-play-after-replacing-bushing-video-attached.html