@TazyMike28 great to hear you are getting so many sets, jealous!
I would say the biggest thing is listening to your body. You should be able to tell when you are getting fatigued to a point where you are susceptible to a back injury. I'm only 21 years old and have dealt with back issues already. Thanks to a good chiropractor and learning to limit myself when I'm feeling fatigued I have been able to avoid more back issues.
Also, be sure to remember that quantity does not always mean quality. Quality sets far outweigh a large quantity of sub par sets.