The White and black Pearls on early 1960's Premiers are definitely a bit thinner than for example modern Delmar wrap. Most of the damages I've seen has been on the top part of the bass drum. Maybe the vibration of the tom-mount causes the glue to break, let loose and eventually break,... just a theory.
Maybe just the combination,...?
Thin vibrating shells, bad glue, thin wrap.
Regarding Premier going for cheap options in the early 1960's,...???
I would doubt that. Just look at the superb chroming and the amazing craftsmanship of those thin birch shells,... probably the best of their time.
Not to mention the die cast hoops.