Am I doing something wrong? (air getting trapped in loop)

Looks 100% better. What is your pump vibration noise like, any improvements possible there? I always try to isolate the mount from the case as much as possible, with foam in my case, or dedicated rubber mounts you can get. My 18W ddc pump makes literally no noise whatsoever with a simple pad made out of a kitchen sponge. You could do something similar with your set up between the bracket and the case. The pump does not have to be fully tightened down, so a generous foam pad between the bracket and the case, and some long screws, will allow you keep it in position and leveling up by adjusting the screws, and the pump noise should be much reduced. That is if it currently an issue for you.
 
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