For reliable print matching, you need both a calibrated/profiled monitor and a profiled printer/ink/paper combination. Once you changed inks, the old Canon profiles were no longer valid, so creating a new printer profile was the right step.

What you should not do is try to print to an uncalibrated or default iMac display profile. The goal of color management is accuracy, not matching an arbitrary screen look.

If the monitor now looks too warm or the reds seem yellow, that points to the monitor calibration target/settings, not the printer profile. Check whether your ColorMunki software allows advanced display settings such as white point, luminance/brightness, contrast, ambient light compensation, or rendering options. A different white point or calibration target may give you a screen appearance you prefer while keeping the workflow accurate.

Also remember that prints and monitors will never look identical: monitors emit light, paper reflects it, and printers have a smaller gamut than displays. Rendering intent can also affect color shifts, especially in saturated colors.

In short: keep the custom printer profile, recalibrate the monitor with better target settings, and use proper color-managed printing rather than the default display profile.