Does anyone know if CP scale in a continuous or step fashion?
i.e. if I am doing a "low risk" challenge and i then remove 12 levels of stat by changing my items and the challenge is still "low risk" do I get the same CP or a bit more?
It’s in a step fashion, to use your terms. Percentage in itself doesn’t matter, only whether the challenge is classed modest/very modest/low risk etc. You can check the Beginner’s Guide here for specific CP each challenge nets on a failure/success.
ok so I may as well give myself the best % within a category then thanks :)
Correct. If your only goal is raising a stat, the fastest way is still to get second chances via social action then spend those to increase stats, but tweaking gear for specific chances lets you raise stats reasonably while making a profit.