[newday777]

First you are running a non ROF tire, yours has 4 ply side walls and not as stiff sidewalls as m/c tires and ROF c/t, so there will be noticeable difference to M/C tire as in your drifting feelings.

Second C/T tread is deeper and more flex first 10,000 miles and thus more of your drifting feelings.

Third air up the tire to max psi cold and play with psi from there. Too low and more drifting feel.

ROF tire will be more sure footed than non ROF tire as sidewalls are stiffer than non ROF. Again, start at max psi.

Austone tire is a 6 ply tire and less drifting feeling after initial breaking in,
6,000-10,000 miles to wear tread down.

 

[newday777]

As far as c/t in corners, they want to stand up straight so you have to push just a little in the corners and will get accustomed to it the more you ride it. The more flatter the tread pattern the more you will feel that have to push feeling. M/C tires are way rounder tread so you just have to think lean and they lean.
600 miles is not enough miles to evaluate the differences.
Be sure and update this post with a reply to it here (save it in your favorite bookmark) once you have over 10,000 miles on it and also at it's end of service to give an experienced evaluation. (No offense meant, just the facts of riding a C/T)

 

[newday777]

Have properly greased and torqued the steering bearing nut? Too tight and you will get a wandering big-time.

Also too low pressure in front tire will do the same. 42psi.

Fork and shock oil more than a year old? Leaking?
Fork bushings over 35,000 and not checked for fit
Do a search on stiction tuning of the bushings.

A C/T will stick better than m/c tire and bring to light you have something that needs attention.

 

[newday777]

As sidecar nut: BEST rear tire I've run on our GL1500 rig in 11 years! Tried Dunlop E3, Metzeler 880, Avon Venom. All gave lousy rear tire mileage. Run 42 psi cold. Ride is much better. Rig handles very well [run Avon Venom on front].
Wife always rides 2-up with me[has arthritic knees, which bother her when riding in hack with legs straight out]. My 2 cents.....papasmurf

Tom
You put on the Austone didn't you?