On a Motorcycle trail is extremely important and as a road racer for over 20 years I know the hard way what a few mm can do to strait line stability. Having a tank slapper at 280 Km/h is something not to wish for. In the MC world It is very common to work with trail and you are absolutely right, more trail gives more straight line stability and less responsiveness/willingness to turning.
Karsten
Karsten