I just finished my dbl weave shawl and would like to use the rest of my warp for a tube weaving project. Do I need to change my sett from 8epi to 12? I would like a tighter weave to make a bag. I could alternatively wash the Shetland in hot water and do some felting; I havent done that (on purpose at least) but that may work also, but still think I need a tighter sett? Thank you for any suggestions! Also, can I leave my tie-up the same and treadle TB, TB?