I presume by "double attack" you mean "double hinges" or "double hinge attachments". Yes, two are much sturdier than one.
I notice that you've built the tail travel stops as cutaways in the hinges. Others claim to have had success with this. But I think that it is hazardous: You have an NORMOUS lever arm with feet of tail working against a stop maybe an inch from the center of the pivot axis.
I think it's better to do the stop by putting a bumper on the back of the generator - a foot or two, rather than an inch or so, from the axis. (You can use an energy-absorbing rubber, such as a bumper intended for an automobile suspension, to reduce impact shock and rebound, too.)
Whatever you do, be sure you design your stops so the momentum doesn't tend to lift the tail off the hinge when it hits the stop, or arrange some additional stop to keep the tail from coming off the pivot.
