I have a Janome 6600P also and find that NOT using the accufeed when piecing works better. I just use a regular 1/4" foot and not engaging the accufeed. It does great then for both piecing and FMQ. I do use the accufeed when straight-line quilting and sewing the binding on. Although, I recently bought a Singer Featherweight 221 and I admit that I love the wonderful straight, even-tensioned stitch I get on it. I have been doing quite a bit of piecing on it. We were both born in 1953 - so I think we have a "bond".
