Hi Alpharalpha,
So, it looks like you’re taking a different approach now in your search for the perfect mattress! 
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llo, I have managed to find a couple of double sided mattresses with a minimum of padding to minimize the indentation problem that seems to be going on.
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This is unfortunately all too common with the major brands in the industry, as the prevalent use of lower-density foams results in decreased comfort life and excessive body impressions, whether or not the foam feels firm (has a high ILD/IFD, but a low density).
The major brands such as Sealy/Stearns & Foster, Simmons, and Serta all tend to use lower quality and less durable materials in their mattresses than most of their smaller competitors that will tend to soften or break down prematurely relative to the price you pay which is why I would generally suggest avoiding all of them completely (along with the major retailers that focus on them as well) regardless of how they may feel in a showroom along with any mattress where you aren’t able to find out the type and quality/durability of the materials inside it (see the foam durability guidelines here, these additional guidelines here along with post #3 here and post #12 here and post #404 here). Until you can find those details about the foam used in those mattresses, you won’t be able to make an educated decision, and many of these brands unfortunately won’t even share foam densities with their representatives or retailers.
(if anyone knows of others I’d appreciate any information.) Thanks.
Unfortunately, I don’t keep a record of the individual mattresses or their specs that the retailers and manufacturers in the hundreds of forum lists throughout the forum carry on their floor or have available online (it would be a bigger job than anyone could keep up with in a constantly changing market). Perhaps some of the more knowledgeable members on this site can help provide some insights of better quality two-sided mattresses for you.
Phoenix