Agree with R_Horn, how about a video next brew...?
So, thinking out-loud:
a.) only in the last 8 inches of tubing after the autosparge
b.) mostly in the beginning when you first start your recirculation (purging air from hoses?... seen brews where the air never fully purges from the hoses unless I tilt/mess with them a lot during recirc, as the flow rates are not high-enough to push 100% of the smaller bubbles out quickly.
c.) it's a small stream or individual air bubbles, not significant volume of "aeration" as if with a stone...?
IF that's the case, (and I'm one to be anal about things like this), then it's probably not going to effect your beer in any detectable way.
"Turbulence" is relative... if it's "burping" significant air bubbles out the sparge hose... then that would be inexplicably disturbing.
Besides, I can't find the reference right now, but hasn't there been a long-standing debate on the actual/detectable effects of hot-side aeration at homebrew volumes & processes? Thought it had to be rather significant before it really effected anything worth worrying about ... such as pouring the full volume of wort between containers while hot...
Do I misunderstand perhaps?