Thanks for asking/reminding me to follow up. I ended up getting new pistons and a new cat. It's much better now (smoother/quieter). It's too soon to tell what the oil consumption rate is exactly, but it's much less than before. It seems most of the oil consumption since the rebuild was in the first few hundred miles. I'm just glad the CEL is off and I don't have to change the spark plugs every couple months. I'm going to dump the break-in fill in the next day or so and see/let you all know how she does with a normal OCI. I think it was a worthy investment since the car is a real cherry otherwise.