When I was young and stupid I used to run Mavic 729 rims on my trail bike and once even 2.7 tyres from my DH bike just to see what it was like 3.0s were available back then, but they seemed a bit ‘much’ and it was a bit of luck the 2.7s fitted the rear (they had room to spare on my 2006 era 36s – so much for boost eh?) – it rode like utter shit, honestly it was appalling.
I know these aren’t the same, but I can’t really work out how being lighter will make them all less draggy and dull – yeah you can tip it into corners seemingly never having to brake, but most of the time it was because you never had the speed in the first place to warrant the brakes as much as it having tonnes of grip.