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47c vs 35c tyres for speed/efficiency when touring

I've been reading up about the move towards wider road tyres to reduce rolling resistance, increase comfort and, potentially, speed. It seems that for racers, there is a sweet spot around the 28/30mm mark beyond which the benefits of the counterintuitively smaller contact patch of a wider tyre begins to be outweighed by the loss of aerodynamics...

There's loads of info about this for this size bracket of tyre, but less so for wider, touring tyres.

I have a hybrid framed tourer and have had 47c 1.75in Conti Contact tyres on it for years. Really comfy and have served me well touring in places like Morocco and Jordan where the tarmac can be poor in out of the way places.

I'm just about to do the Lon Las Cymru, Wales end-to-end and have on a whim bought some 35c Schwalbe Marathon Classics on the off chance that they might roll faster than the 47cs on the good tarmac expected on this route. They are also about 250g lighter each than the Contis.

Am I right, though? According to Bicycle Rolling Resistance the marathons have much less rolling resistance and less weight, but what about internal friction, contact patch sizes, etc etc? The marathons have noticeably stiffer casing and obviously higher pressures...

Sorry, probably just getting myself all confused for not much difference and should've saved the £55!

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