My favorite "now" of that size range is my 10 inch f/5 Teeter STS (tube), given my storage/viewing conditions at home. I have owned both tube and truss dobs in the 8 and 10 inch sizes. The tube dob has its compromises yet works well for my very light polluted back yard, with tons of neighbor's lights of a long row of townhouses.
The 10 inch has a premium mirror cell (Aurora precision) along with other premium components. Compared to the Orion 10 inch I briefly owned, the overall ease of use of the Teeter is well worth the extra cost I paid. That said, the optics in the Orion XT10i were actually quite good. Our DC burbs do not have the best seeing, so that plays a role, not just the optics.
Perhaps the OP's "soft" views through a 10 inch set of commercial dobs was due in part to seeing conditions at the time, or the scopes not being carefully collimated, or not reaching ambient temps or a cell that was too tight on the mirror, or a secondary mirror that needed upgrading, or.... multiple factors all at once.
A 12.5 inch premium truss dob is probably the largest I would use at home. Ryan Goodson of NMT just gave an example online of a 14 inch f/4t thin mirrored russ scope that had a 40 pound heaviest component. So I would make an exception for a scope like that! Plus his wood work looks amazing.
The 16 inch f/4 that I own that is stored out West is probably my sweet spot, followed now closely by the 14.5 inch Starmaster that I recently bought. Both are feet on the ground scopes, good for darker skies. Have I tried the 14.5 inch from home? Sure, but it is not practical without a garage and the glare from all the houses. It is also not the OP's list of range of 6-12 inches.
Now my real favorite would be a 20 inch f/3.3 scope, but that is another thread ;-)
The 10 inch can be wheeled out to my back deck family easily, and set up for cooling (or now it would be warming up) within minutes. It holds collimation very well, just needing a tweak after checking with the Glatter set of tools. As I get older, keeping it simple is a good thing.