Bifold Door Folding in - Hinges and Snuggers

I am writing this note for your help and advice on resolving problems with bifold doors in an old home that I bought. I have 8 sets of doors with these problems. I don't know who made these door but they were probably built in the mid to late1970's. The house was built in 1977.

As best as I can describe the problems, the doors fold in at the joints where the hinges are. Please note bottom and top as well as folded in at center of each pair of doors.

They each have dual Sliding Snuggers, one for each pair of doors. At least one snugger has a Stanley name on it.The track that they ride in is about 7/8 in wide.

They also have three non-mortise hinges for each pair of doors.
Most of these have bent over time.

I would like to find a solution for all of these sets of doors.
Is the cause of these problems most likely the hinges or snuggers or something else?
Is it feasible to replace the slide snuggers with rollers and a single centered snugger?
Do you have any suggestions for better hinges?

I appreciate any advice and recommendations that you can provide.

Thank you .. Kevin