Just to follow up on this; I have noticed a single S19XP hashboard with a chain of 110 ASICs (BM1366), running at 46 TH/s sends out new work to the whole chain every 2.14s
if it were just rolling nonce, the chain would need new work every 93us
Its a shame there is so little info on the newer chips.
On a happier note; my redesigned version can be pushed to 350GHs+, and on a sad note; the 3.3V regulator from Mouser is either fake or junk as it blows instantly when fed with 12V (also blew up the esp), so I will have to do another version yet again with another regulator which will again take a month to produce/test.