I'd say you're making a mountain out of a molehill and about to ruin a perfect good mount. Once aligned you still have to manually lock the mount in azimuth and altitude, or it will be wobbly.
Here's how I do it and with practice all done in 5 minutes
http://www.iceinspace.com.au/forum/s...d.php?t=172879
With plate solving obviously you can get closer than I do, but then there are other effects such as atmospheric refraction that apply so there really isn't a perfect way for a scope to track, without optical feedback from a guider of some sort, so its a bit pointless obsessing about "perfect" polar alignment better than 15 arc minutes.