I am weaving a huck lace shawl with Tencel on a 4 harness floor loom. The same threads on the right hand selvedge keep breaking close to the fabric. It is always the same three threads all on harness 1. I thought maybe the heddles were rough so I changed to string heddles. I thought the weights on the broken threads were too heavy, so I changed those. I thought there was too much draw in, so I slid the reed over a bit to even it out. Nothing has helped and it is really frustrating!!! Any ideas? Thank you