For a quick fix there's no reason to change both discs at all, they are totally independent per caliper and will adjust to thickness accordingly.
Fazerider's right in saying your caliper is highly likely the main cause, in fact to warp it that bad i'm surprised you didn't notice an issue earlier by noise or bad feeling.
Fazerider's right in saying your caliper is highly likely the main cause, in fact to warp it that bad i'm surprised you didn't notice an issue earlier by noise or bad feeling.
More people are born because of alcohol than will ever die from it.