On the subject of certain aircraft being 'prone' to hard touch-downs (I personally find I have occasional days where I am prone to hard landings and the more I try to soften the landings, the worse they get) ...Is the B737-800 one of them? I have flown several times recently as a pax in 738's and most of the touch downs could best be described as 'positive.' Other people have commented the same, although usually mentioning the carrier rather than the aircraft type...I won't mention the airline as I don't think it is relevent, suffice to say they get a lot of coverage on this website!
