Correcting taking putter outside the line?

[EdZ]

I have a conventional grip. I recently changed my stance to making it totally open and use #1 accumlator to push down the line.

Alas, if your shoulder line is open, you'll be outside going back

Regardless of how your feet/knees/hips may be aligned, especially in putting, the shoulder line/alignment is what matters most.

Having the lower body open can be very helpful in seeing the line and in giving the hands room on the through swing, but always keep those shoulders aligned parallel to your targetline.