I like to pack heavy on international trips, to bring back all my shopping. I would recommend going as big as you can with a Rimowa Salsa. Then you could always underpack. You want to have more weight and space available to you when you need it. Not less. Also when I fly UA as a 1K internationally I get 70lbs x 3 bags. This was really valuable for my recent international move. I was happy to have the extra size and weight for that.
Rimowa makes a newer size that is the maximum linear dimensions for airlines now. The older 29" are technically too big. however they are really only about 2-3 inches and no one has ever stopped me.
I do agree clamshells are less convenient. But not enough for me to sacrifice weight savings.
Interested in seeing what the B&R Torq hard sides are like. I only buy B&R nylon luggage in carry on sizes because they are too heavy compared to hard luggage like Rimowa for checked bags.
Sorry to hear about the Limbo. my Topas 29" looks like it came out of a war zone every time I travel. The nice part is that all metal is easily repaired and the bag protects contents and is still light. Bad part is that it requires a tune up 1-2 times a year