"and in dc ww is supposedly stronger than herc, ergo stronger than cm."
And yet, where is the proof of that?
CM tangles with SM physically better than WW does. Has been stated to be his exact equal more than once while WW is definatly not shown to be as or stronger. Not even stated as such.
As for the WW-Herc issue:
-both- have claims to be stronger.
WW claimed Herc held briefly the earth and she couldnt move it with help.
All the times they showed up together she never showed to be stronger.
Taking the Earth feat wich iirc its cannon at DC and the three times holding Paradise`s Island weight against someone whos main feats are always with help sure makes her look not stronger in my eyes.
Heck even PreCrisis when she was tagged stronger than him, had Cap Marvel beating Supes ocassionally and WW also losing against Herc.