I would love to have a couple of the exact same ST35 too vertically or horizontally bi amp. I would love them to run my 10 inch mid range and horn tweeter. I think they would blame, just fine. It was my push pull KT88 running the 15 INCH woofers.
The 845 on the 10 and 45 on the horn are good. But I assume a more matched amplifier on those two would bring a little better cohesion.