If you are looking for a piano with heavy touch and dull sound try a Chickering Grand.
Again, as with the Forester earlier, the characterization of dull and heavy for Chickering is an over-generalization based on one example. Chickering's are actually more often characterized as "bright", and for a given size, they're usually a bit more powerful than the competition at their quality level. If one is in good voice, though, I would say it is by nature not "bright", but rather it is "dark", but with a coating of lyrical shimmer that some perceive as "bright". I have come to think of it as being much closer to the European tradition of the sound of the piano sound envelope akin to Boesendorfer than most of its American brethren, which makes the term "American sound" seem a bit ironic, given that Chickering was the first and among the most highly regarded American makes. That "American sound" is probably a complex sound associated with big Baldwins and NY Steinways--a sound where the upper partials are strongly evident at all levels of play. Where I see Chickering nearest its ideal voicing is having much more of a clean fundamental at pp levels with just a hint of those complex overtones from the higher partials, but with those partials fully in evidence at FFFF levels--but never to that point of "complexity" that tends toward harshness of some of the other American makes at FFFF levels. Hence, I think "dark" is a good characterization.
Characterization of the action as "heavy" might be apt if the action has been regulated so as to be heavy. My own concert grand is regulated to be quite light and definitely deserves the oft-heard description of "buttery". My two touring/recording concert pianist friends both say it is the most easy but responsive and controllable action they've ever played. I regulate my own piano and have regulated it such that the action was uniformly heavy and it did indeed subdue the power and tone. But it is equally possible to regulate it so that it is very light and the power and tone come up. I like it on the light side of medium. I have no trouble whatsoever making it whisper beautifully at pppp levels, without the necessity of getting there by making the touch heavy. If anything, regulating it for a heavy touch, which is certainly possible, robs it of the high end power I would want for FFFF.
I think it really is the case that regulation, tuning and voicing are mostly what account for the differences people sometimes attribute to a make, even while not seeing the inconsistency that suggests when two identical models side-by-side exhibit entirely opposite extremes of dull/bright, light/heavy.
Further, it was a 6'5", probably much the same as your own, that led me to look for the concert grand version. The thing that stood out for me and very nearly made me buy that spectacular 6'5"was that it was
light of action and shimmeringly brilliant and head and shoulders more powerful than all the Steinways, Masons and Kawais on the floor around it. It was
anything but dull and heavy. If it had been either, I'd never have given it the time of day, much less looked for the best and biggest one I could find. I'd have bought a Steinway or Mason instead, if that
had been the case.