"air bubbles underwater... " this makes me think you might have bad BEARINGS or a rough Cone or two. Your "new' freehub may not be so nice, internally.... or the installer didn't get things quite right on the Axle bearings setup..
i'd take a close look/feel of that new Freehub.
as to the address... i just copy/pasted this part into youtube... youtu.be/q_5lLROkJdk your 'tube came right up. ;-)
Question: how tight is your Quick Release? they TIGHTEN the axle bearings when snugged , you know.......... Zero play when not QR'd means Too tight when QR'd.... I've had to use a helper pipe on QR's to get them loose before...!
Last edited by maddog34; 11-18-22 at 05:45 PM.