definitely, I wouldn't use any other formula for gamut
the LCH breakdown is an extension of dE94 in CalMAN
for starters, you can set color space to "auto" and set color to get red luminance as close as possible and the secondary hues a low as possible overall
later on, you can use "custom" color space to dial in LCH for each primary and secondary
QuickView Grayscale.pdf 58.2724609375k . file
You do but you get Red as close as you can first.
L = Luma Y
C = Saturation y
H = Hue x
Primaries get Luma matched, Secondaries get Hue matched... and then have fun balancing back and forth for hours until it's all as perfect as can be (at this point a little OCD is required ).
Adjust Color Gamut.pdf 116.76171875k . file
Gamut After.pdf 115.986328125k . file
Enhanced Gamut .pdf 116.4111328125k . file