Thanks for watching! Sorry to answer a question with a question, What temp did you have the rec tec at? On mine it smokes quite a bit at the lowest setting which is 180 The hotter I have the less amount of smoke I have. I would think if you had it on for 15 hours that you had pretty low. Another question would be what type of pellets you are using, maybe try something else.
Finally, Pellet grills in general don't give off heavy smoke you can try to supplement with a smoking tube and see how that works for you... Thanks