2-3 min near a 100 watt bulb is enough.
Your picture looks quite good except for filtration. Note that the filtration works the opposite way compared to normal negative processing. If you need to add yellow, you increase yellow filtration. So it feels more logical, the effect is exactly the same as you can see in the image projected by the enlarger.
And if you are already at zero on magenta, you can add both C and Y at same amounts.