But it's never explained what exactly windchop is. If Roshi is using ki for it then it has to be his full power. Ki surpression is completely foreign at this point.
Alternatively, Roshi's wind chop could have been a ki attack and as we know nobody in this part of the story can surpress their ki so wind chop would be Roshi's full power.
There are so many plot holes, retcons, and inconsistencies...I think I will go with one of the earliest examples since it defies logic for multiple reasons:
Goku power polling the Rabbit Gang to the moon. Not only is this feat massively what the power pole has been shown to extend to but after...
Tien could have used the multi-form technique. Splitting your power in 4 and giving yourself 3 extra training partners of equal level seems like a pretty effective training method.
Less than half means exactly that, less than half power.
Toriyama is a simple man who regularly forgets what he writes and contradicts himself, he isn't thinking about all these complIcated headcanons.
The Majin charm doesn't make you anymore durable than your power level would suggest. We saw an equal fight with the Msjin charm, SSJ2 Goku vs Majin Vegeta and they both were equally hurt and fatigued.
Because Spopovich held back to torture Videl. Goku and the others even noted how unusual it was for Spopovich to get up after taking so many would-be devastating attacks.
The early Z scouter numbers are just too tight to fit the appropriate gaps. Popo and Kami have to be wayyyy weaker than Goku/Piccolo while still stronger than the humans.