I love the handling of my non-descript 531 tourer when descending full loaded
(bike weight around 40kg and rider 63kg)
It sticks to road like glue and feels smooth to ride.
However, when I take the luggage off for a thrash like I did with the locals in Tasman N.Z I was alarmed at the skittish nature of the beast!
Descending was a scary experience and I hated the jarring and bouncing.
Of course I could have let some air out of the tyres...
Same again at the semaine federal after I'd cycles 2500km to get there fully laden, I took all my baggage off to thrash Johnny Foreign types on their carbon efforts. After a couple of days I got used to the ride quality.