Yeah, I've done the bleed with the rear hose nearly completely vertical and with the official funnel/cup, left it for hours, tapped the hose to coax bubbles, pumped the lever, etc, ... all the tricks I could find online. I've got a syringe now, so I'm going to retry with that. Only the long rear hose run has given me less than ideal feel, so still reworking it.

Your resonant vibration with the Hope rotor on the rear?