What did I just say?!I actually saved 100g over my old one and performance seems similar so far, that was the whole point of this thread (i.e. bead material doesn't really affect performance but casing does).
Luckily for me, the matching (except full DH casing) rear I bought was a ludicrous 140g over their claimed weight, so I gained back my saving in a very roundabout way.
WTF Schwalbe. Thanks for nothing.