Regarding Bosendoerfer 214, the action was not heavy, it was just difficult to control. It is an uncomfortable feeling I already had with the Bosies of not "being in control " of the situation ! I am sure this feeling can disappear with heavy practice when you have a Bosie at home and play it regularly. The tone was wonderful.
As far as Steingraeber is concerned I played the 272 a few months ago and, Iumonito, I was not so much impressed. The 205 S is my favorite model. The 272 is still a prototype. If I am correctly informed only 15 of these have been manufactured to this day !!
Anyway, I am quite sure I will never have a piano that huge in my home. Bluthner Model 2 (238) is the top limit !