So I am attempting to quilt my newest project (second quilt ever) and I am having tension issues. Have ripper out twice now. My first project was a much smaller lap quilt and quilted like a breeze! Second one not so much!!!! all my settings are the same, but I keep getting bottom buggers and I am not sure of the cause. I have tried..................

Changing the spool and the bobbin thread. My walking foot seems to be in order. My settings are the same as last time tension at 2.5 and stitch length at 3.0. 100% cotton all the way, batting and fabric. Please tell this newbie what she is doing wrong!?!?!

TIA,
Donna