Hummmm??????? sounds like you did everything right, exhaust vents all the way open??? Maybe put them in a bag for a couple of days and let them mellow out
Dang nab it I just did another one but the only thing I did different was I cold smoked mine - no heat but I don't think that would have made a difference but maybe being warm pretzels they adheared more of the smoke,,,,
Try another batch and either cold smoke them or smoke them for 1hr taste them and go from there
I wish I could help more
Let me know if I can help any further
GOOD LUCK