Hi,
?Checked the Manufacturers sites for revised firmwares?
That's the ONLY approach.
=>IF<= the periphs were built with sufficient internal "leeways " to allow
future extra capabilities then a change to newly issued revisions =>COULD<==
allow this increase to 90 mins....but DON'T expect this to be.
After all you bought 64 or a 70 mins capacity drives and no one is bound to
be so kind in any way and to offer you more.