ATTENTION! I HAVE THE ANSWER!!!
There's a hexagonal bolt thingy for each fin (only hexagon shaped thingy, can't miss it, there's 2 of them)
use the same tool you used to upgrade to the turbo fins (pliers). twist that hexagon bolt thingy until it is TIGHT.
you know how the pedals can be adjusted for tall people or short people? well, the noise has everything to do with the pins that make that adjustment possible. those pins aren't going in deep enough, because that hexagonal bolt thingy isn't tight enough to force them in all the way.
I HAD THIS EXACT SAME PROBLEM AND JUST GOT FINISHED FIXING IT. SUPER QUIET NOW!!!
Don't read the rest of the comments; you guys have no idea what you're talking about. PROBLEM SOLVED; CONVERSATION OVER. You're welcome. goodbye.