I just bought a new steel city hollow chisel mortiser. I made some test cuts and the mortiser works great but the chisel (1/4) deflects to the open side of the chisel about 1/16" when cutting. I was going to try sharpening the chisel, but I know that most of the time the cutting implement included with a tool is junk. So which brand of hollow chisel should I buy? I looked first at the Lee Valley "premium set" ($115) I also saw they had an Economy set for about $60. Are there any recommended brands on these or ones I should stay away from?