I am not sure about filtering, if it gets out the pumpkin slurry. Maybe a combination of techniques is needed. On mine, the bottles have very little sediment on the bottom. I used Irish Moss in the boil, when transferring from primary to secondary I used a paint strainer which took out much of it. Secondary to bottling bucket, cold crashed, then racked from the top down leaving as much of the trub behind. I just poured one if these, and after nearly five weeks in the bottle I have excellent carbonation (I was worried)
The head is creamy, milk-stout like, and the taste, fantastic!
Quick pic (sorry about the quality)