When I do the twirl/swirl thing on a block - I unpick the threads to the intersection on one seam - and LEAVE about 1/4 to 1/2 inch of thread in the seam allowance. I do NOT clip the thread right at the intersection.
A twisted seam bothers me more than a carefully clipped seam. A twisted seam bothers me A LOT!!!
Even when clipping seams on a garment - I try to stagger the clips so that - IMO - the seam has a bit more integrity.