Today I grinded off the tip of the tool a bit to reduce the rake angle to a very small positive value as advised in some of the replies and WA LA !!! It makes a day and night difference ! not only the tool cuts in every stroke now, the force needed is very consistent and significantly less because the tool does not dig into the metal deeper than intended anymore. With the aid of a little oil, the cutting action is now super smooth and there is no more wavy surfaces ! A million thanks to you guys ! I would not have made it without your help.