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You're setting your chain slack way too tight if you are setting it with the rear suspension at full droop (fully extended). It should be about 38mm of slack at full droop, and that is 38mm at the tightest point of the chain.
The actual specification is a bit ridiculous and hard to achieve without either using ratchet straps or unbolting the rear shock and manually setting the swing arm at the right angle.
The actual slack spec is 15mm at the tightest point of the chain when the counter-shaft (shaft the sprocket is on) swing arm pivot, and rear axle are all in perfect alignment. This is where the chain is at it's tightest through the whole arc of it's travel.
I set my bike to this spec once, marked the point of the chain I set the slack to, and then measured again with my rear suspension at full droop. and ended up with the 38mm number.
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