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In case this hasn't arisen before -- when declaring there is usually no prominent distinction between the dummy and the declarer's hand. In f2f bridge declarer's hand is automatically invisible to the defenders and plans are made accordingly. On BBO one can lose sight of that, at least I do. And yesterday I saw Peter Hollands mulling over his plan of play in one of his videos and then suddenly say that, oh, that's the concealed hand so they can't see that holding. A labeling of the hands as "dummy" and "concealed" would mostly fix that.

I challenged tim_ucin more than 2 days ago, he accepted, I played the boards when I saw it, but he's still not finished. There are 22 hours left (it's 11 AM here right now) but just posting the screenshot in case he doesn't finish today. I don't want to replay the boards if he bails.

If the hand is really slammish relay is usually best. There are some hands where you have a stopper issue; for example: Kx Qx xxx AKJxxx If partner has 5422 any of 3nt, 4s, 5c could be right (6c needs extras but might be possible). This is probably easier in natural bidding! But strong jump shifts don’t really help you here... you need to hear openers second suit and then break relay. It seems like appropriate relay breaks help you more here.

And a double might even cost a trick (or two?) because it will alert West of the unfavorable spade situation.

Irrespective of whether the opponents had misinformed you during the bidding, the last thing you want to do is to alert them that 6♠ is the wrong contract and for them to run to 6NT. If they are in the wrong contract and your teammates are in a makeable one, it's going to be a good result whatever happens. Another +50 isn't going to make a great deal of difference at IMPs or VPs.