Not that I am any expert LOL only had our A/S for just over a month but I have had so much help from everyone on this forum that I have this desperate need to provide help in return (if I can).
so leaning on my boating experience (and only one freezing night in the A/S in Kentucky on our Journey with her.
.....as many boat galleys have the same set up with the table breaking down into a double bed.
The problem I see is that because the Dinette gets so much use, builders have to have a really high grade firm foam to stand up to the test of time. This makes for a pretty hard sleep.
But I also see that in many cases the builders do not (boat or airstream) go the extra step with the 2nd & possibly 3rd layer of foams - such as in quality matresses and seat cushions on living room sets.
Not sure about others but the Goucho style couches are basically set up with the same foam - so I doubt their comfort would be any better. Might be a little longer though.
Short of upgrading your cushions - you could consider padding them up inside depending on the amount of room your covers allow.
Or get yourself a Mattress cover/pad (egg shell foam, or the like) and Cut to size - go the extra mile and make a zippered slip cover for it. Not sure what your under seat storage is like on your model but it could pop in there out of the way possibly - or roll it up like a back ballast (seen someone do something similar with their bedding in the photo albums)
Some people have substitued the couch or dinette for a futon bed - well we have one in our house and I would say - the Goucho is more comfortable
We tend to agree with you on the Dinette -
Our Dinette doubles as two twins Kind of a neat set up - the backrest flips up to make the seat area wider and the short side end section flips out to make the lenght of the second Twin in front of the door - but still leaves just enough room to get out the door in an emergency. We also have a goucho couch that makes up into a double in the back left and (Back right wet bath).
We are lucky too that the table can be half open leaving lots of living room. Or full out to seat 5-6 in a pinch for a Dinner Party - oh and one at the end makes 7 or if you really like closeness 2 at the end make 8, as long as we don't tip the weigh scale
when we get to the limit we will just have to move outside - or to a bigger fellow Streamers place.
Anyway hope that helps a bit...Can't wait to get in, our first 3 nighter.