Well, I just spent an hour on it, and I think it's on me, I had discrepencies for all my conversions (CM is my baseline) for the last days, but it seems on VTDM it is because I overlooked Windows Sensitivity, and the other games were modded oldies were I probably messed up something, I just did a try for HL/Quake and I get 0.590909, wich seems right.
My bad, the issues I encountered pointed at the CM calculations but it seems like it was an addition of other mistakes and misunderstandings on my side.
As usual thank you for the quick reply, and sorry for your time on this one.