I have tried a couple of pads bought from aliexpress, a velour one (dismissed) and a 'hybrid (felt/ fake leather) one that in stock form sounds very bassy and bloaty on the M1570, but with some cuts on the leather part sounds very well: I think I prefer it over both stock pads (I was using stock velour over stock leather before). Unfortunately, cuts (eleven for each side) are made with a simple pair of scissors, and the aesthetic result is not very good, but the sound is. By ear (I cannot measure them) it's the best midrange, with no hint of honkiness and almost no need to equalize. Worth a try, since they are very cheap (6,80 eur a pair, shipped from china, it's the 110mm version). I ordered another two pairs to try a different number of holes on each side and/or holes on the inside perimeter.
https://it.aliexpress.com/item/1005...st_main.5.1ffb3696W2VRyL&gatewayAdapt=glo2ita