You’re not following the instructions, or using the bleed funnel.
– Bleed from the caliper up into the bleed funnel, by pushing fluid up from the syringe attached to the caliper.
– Plug bleed funnel, close the nipple, remove syringe, DON’T TOUCH THE LEVER.
– Open nipple & allow contents of funnel to drain through the caliper into plastic bag, tapping the hose, caliper, lever as it goes. Top up funnel to ensure you’re not pulling air into the system & continue until no further bubbles appear from the caliper.
– Close nipple, plug funnel
– Pump lever. Bubbles will rise into the funnel. Continue pumping until no further bubbles rise into the funnel.
– Lever should feel rock-solid; not remotely spongey. Repeat steps above if it does.
This is the bit that isn’t in the instructions, but made a difference to the feel of mine:
– Remove bleed block, add pads & red pad spacer.
– Pump lever to move pistons to where they’ll be when on the bike.
– Bubbles should rise into funnel.
– Plug funnel & remove.
– Find Hope video about caliper centralisation. Following instructions to fit the caliper central to the disc & ensure you don’t have a dominant piston. I’ve found you’ll need to fiddle with the piston positions every couple of rides to keep them feeling firm.