Hi Jastone,
My Sebenza was ever-so-slightly off-center when new, even after disassembly and cleaning. On the advice of another thread here on BF that I can't seem to find, I had success getting the blade spot-on by loosening all the screws and then retightening beginning with the pivot and working back to the end of the handle. When I cinched down the final screw, the blade eased over that last little bit to dead center and has stayed that way for many months. YMMV.