For me, Rising Stonehenge has been the most consistent and easy to clear paper for Kallitype and Pt/Pd. I bought a couple hundred sheets of the Rising Stonehenge before the mill closed, so I will be out of the market for a little while. However, the day will come when I must replenish. I will be interested to see if the new "Stonehenge" works as well for me. In fact, I should probably test now...
I have had success with Bergger Cot32, but at over 4X the price of Rising Stonehenge I will be going through the present stock of Bergger without replacing it. Arches Platine worked (not as well as Rising Stonehenge) but is expensive as well. Lenox was highly regarded by Dick Arentz in his Pt/Pd Printing book, but did not work for me at all.
Time to get on the Strathmore 500 bandwagon?