Paper wrinkles are, actually, caused by using off brand toner. Off brand toner cartridges leak. Sad fact of life, but sorry - once the seal is broken to refill them, many off brands aren't good at resealing. (I use V4Ink - out of the 3 or 4 I've tried, they have the best consistent quality.) Leaked toner builds up on your paper rollers as well as onto the edges of your drum. Hence crinkled paper.
Use an air blower and a soft rag, pull the drum and paper drawers, open the back, and clean out the printer every week. (You can find instructions on the Net). That will save you a lot in stress and money.