What method are you using to read them? If just a USB drive or an internal drive on a normal floppy controller, you might get better luck with a device such as the KryoFlux (if you are really determined to get that data back). It is a specialized floppy controller that records the timing of the flux reversals on the media, with the ability to sample a single track about 35 times in one pass, and retry many many times in an attempt to get everything. then software converts that to a usable disk image file.
If you are not interested on spending money on such a device, perhaps you could send the media to someone that has one. (Such as myself.)