If you don't back the force off at least 50% when you put that new blade in, you will break the tip right off, at the start. Very easy to break the tips off those Clean Cut Blades.
This has been posted hundreds and hundreds of times. The force is determined by the blade depth and vinyl being used. Cuts are not determined by force. until the blade depth is correct. Blade depth MUST be correct first. A correct blade depth, will not cut into the wax paper backing.
To start with, you should set your blade depth correctly, by taking the blade holder out of the machine, and firmly cut across a piece of scrap vinyl, you will be cutting. You should only be cutting the vinyl and barely a mark on wax paper backing, Adjust blade to get there, Then put the blade holder back in machine, and use the force of the machine to get there, same results, only cutting the vinyl and barely a mark in wax paper backing. You should barely see and feel the blade out of the blade holder. Regular sign vinyl is only 2-3 mil thick. You only cut with the very tip of the blade.