I think the other way of limiting will be needed (using your blender tool).
Using your original curve, load it into the cool side of the blender tool.
Then fill the warm side with zeros (all the way down, all zeros).
Then go to the blender sheet and set the “Neutral %” to 50.
This has now turned the blender tool into a “limiting” tool. If cool is set to 100 then everything will be normal (100% ink printing) but if you set the cool number less than 100 this will print with correspondingly less ink. I suggest setting all the cool numbers at 75% (75% of ink) and running a print test.
After successfully eliminating over inking, linearize that new limited curve.