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You guessed right, the Corsa G thread is wide, but not quite enough to really wrap the rubber round to prevent the sidewall from getting too exposed when on a wider rims.
This simply mean even the slightest foolish terrain can cause more damages.
I have had customers' coming in with similar problem, it's usually when I found out they're riding their £4,000 road bike on the Putney towpath!
I have been on Mavic A719 for a long time, but I have just bought a pair of 55mm tubeless sausage carbon wheels from Stayer Cycles. Can't remember internal width but outer is 25mm
EDit: are you asking because of the sidecuts? I got them because of foolish terrain. Tyres have been absolutely fine most of last summer. Brought me from cat 4 to 3 and have done probably 3-4000km before I took them offroad and killed them.