After a few days on the bass, they now feel much stiffer and are exactly what I was hoping.
IMHO and in my experience it's a matter of habit.
for example, a few months ago I dived into Rotosound Funkmaster strings, 30-90 set; I've been using them in the past, but left light strings for a long time.
so I went from 43-110 (billy sheehan set) to 30-90, and the first reaction I had was feeling them too elastic and loose, difficult to pluck with the right hand, and too thin to be played correctly with the left hand.
after a few days using them I got used, and they felt "normal"

so normal that another bass with the 43-110 set felt impossible to play.
last month I switched on two basses from 43-110 to 55-105 flat (Fender and GHS), and at first I couldn't get a clean execution, but after a week they became my "normal" strings, and now the basses with 43-110 rounds feel loose and thin.
you just have to get yourself used to the set.
the real "scientific experiment" you can try is to switch on the same bass to an identical set of DR, and see if the "new string feel" is different from the actual set.