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Before you change the discs try cleaning the bobbins. Brake cleaner them, then wedge a screwdriver into them and get them revolving freely, maybe the merest hint of lubricant. Once they are all free take the bike for what Mr. Gasa calls an Italian tune-up. Get up to a decent speed on an empty bit of road and apply the brakes lightly at first and progressively harder over the next few runs until you are almost getting the rear wheel to lift. This will wipe clean any surface corrosion/ chemical contamination off the discs. At the end of the exercise, you might find the brakes work remarkably well with no judder. Doesn't cost anything and is quite good fun
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