I have not tried to under-pitch. I need to try it though because my standard practice is the exact opposite.
I have used the Hornindal quite a bit mostly from Omega but I tried the one from Escarpment labs too. In fact, that's the strain that was used in the batch I shipped
@PianoMan today. I used some Ultra Ferm on that batch and was aiming for a brut. This was the first time using that stuff and it didn't finish quite as low as expected but it is a bit more dry consequently with a bit more perceived bitterness than a traditional NE. Since I was shooting for a brut, I wanted over 3 volumes so this batch was fermented at 100F with pressure exceeding 60 psi. I learned the hard way not to try pulling a gravity sample at that pressure through CBDS and a picnic tap. The screw on that floating dip tube didn't hold up and I had to go back in after the cold crash to replace the dip tube.
The fact it was doing it's thing 30 minutes in doesn't surprise me at all. It really is a different animal. If you're a heavy sleeper, you better set your alarm so you can get your dry hops in and tighten the spunding valve for natural carbonation before it's done. I usually start in the neighborhood of 1.060 and 12-15hrs later I'm between 1.015-1.020. I leave my spunding valve around 10psi until I get the dry hops in to help prevent a beer volcano. After the dry hops are in, you'll need to tighten it so you can reach ~40psi to achieve natural carbonation at temps in excess of 90F.
I haven't gotten anything out of Hornindal that I would describe as milky caramel from either they Omega or Escarpment Labs strain.