I think your speed drops below Vref, after that the ground effect is not compensating enough.
In your case I would try aim for almost level flight below 5 feet (why not aim for 0 feet) and close thrust levers a bit later. Floating sounds too passive. Don't worry if you land positively at the end of the flare it won't be hard anyway. You must have felt the gear, to know next time where it is. I always disconnect A/P and A/T early to get the feeling.
This worked for me on the Fokker 50 and the B737 (-3/4/8/900). On the 74 it is more or less the same, Making sure that shortly after the 10 feet call I am in level flight. Close thrust near the end of the flare.
Not sure, but I hope this will help you on 'the Bus'