I'm going to get insert chunks in my face no matter which LNU I use, aren't I?

830 HLD hardness on the roller body, mic'd at 12.073". task is to take the body down to 11.430". i have a ceramic 1.5 inch LNU and a composite carbide 1.5 inch LNU. Boss wants me to run 250 RPM (max of my 44" swing lathe dont ask why im doing something so small on such a big lathe lol) at .035 feed rate. at those settings on 830 HLD, both of my inserts are going to be fucked correct? i should be running the ceramic at 250 RPM .012 feed or carbide at around 150 RPM .024 feed for the best results (even tho any time i try to cut anything over 700 HLD my carbide inserts shatter) or am i totally wrong?

830 HLD hardness on the roller body, mic'd at 12.073". task is to take the body down to 11.430". i have a ceramic 1.5 inch LNU and a composite carbide 1.5 inch LNU. Boss wants me to run 250 RPM (max of my 44" swing lathe dont ask why im doing something so small on such a big lathe lol) at .035 feed rate. at those settings on 830 HLD, both of my inserts are going to be fucked correct? i should be running the ceramic at 250 RPM .012 feed or carbide at around 150 RPM .024 feed for the best results (even tho any time i try to cut anything over 700 HLD my carbide inserts shatter) or am i totally wrong?