I think the 25mm slack needs to be on the upper run of the chain as per the service manual. Otherwise, as stevew has said, you need to have about 50mm on the lower run in the middle.
Can't see how it makes any difference whether you measure the slack on the top or bottom run when on the centre stand. Both run free from the engine sprocket to the rear and as the rear wheel is free to rotate the play will be the same on either run or the chain.
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