You may still need to take the boat out for a run. The pitching, rolling and the wheel turning will purge any remaining air.
Keep that line and half filled jug attached while doing so.
You likely won't have the large burps but save the mess for the jug.
Have you tested the wheels hard over in each direction? They should stop hard with no or very little drift and with pressure on the wheel to turn.. If they feel soft at the turn stop or keep slowly drifting over then you still have some air.
It took me a run or two to finally be able to call it good. Ideally your entire piping and supply sytem would have a slight , constant rise back to the pumps just like your home plumbing has a slight , constant drop to the mains outside. That slight slope doesn't happen on most boats thus the need for a run to do it for you.
At least for the last run the air quantity was extremely small and only minor top ups, no more jug, was enough as the final small bubbles worked thier way out.