Agree with Dave.
Bellies have to be dry to take on smoke. I remove mine from the brine, soak for an hour or so.
Pat them dry with paper towels and then into the fridge on open rack overnight. I then take
racks out and put them on table and let a fan run on them for about an hour. They will get
a bit tacky to the touch....pellicule.
I cold smoke on a Hollow Smoke (mailbox modified) electric using an AMNPS 60-70 degrees F).
Most of my bellies take 16 or more hours to get to good color. Color is how I judge when done.
They wont develop good smoke color until after 12 or more hours.
In your case you should still be good. Spending the night in the fridge will help dry then out. Pat them dry
and run another 6 hour smoke on them, see how they look. If they need more, refridge again and repeat.
I smoke mine over a few days and into the refer while resting. I use brown paper lunchbags while in the refer.