Thanks for the information and I do remember Herters having the stitched wads but as I recall reloaders didn't like them. I'll soon find out but suspect it may cause the wad to tip. Also I thought some of the wad makers claimed it was an advantage to have a quick drop off as a result of open petals ?????
You are exactly right on the thought process and selling point behind the Windjammer 8 petal design.
Some claim the 8 petals give the wad a parachute effect making the wad drop off sooner. Downrange Manufacturing even goes so far to say that it is the most popular wad for 16 yard and skeet applications implying that it lets the wad drop off sooner and opening up the pattern.
The new wads with stitching at the top of the slits have no performance change. Upon firing the little joining piece separates. I never saw the Herter's so I don't know if they were merely not slit at all, or joined at the top.
hmb says "The connected petals help keep the wad from tipping." That implies that petals cause the wad to tip and results in problems. If that were a problem wads would have no petals. Looks like a wad with no petals would catch air and tip every time.