F'cked turbo or shot valve guide seals.
Unless you do very frequent oil changes, valve guide seals dry up and turn to plastic and turbo bearings wear out......it's a sad fact of life unfortunately.
TFSI engines should not and do not chuck out blue smoke, ever. If they do, either the turbo or the guides are worn out.
If the compression test read OK (how many bars? Should be 10+) then it's likely the turbo. Remaps push tired ones over the edge.
The rpm dropping and cut-outs is probably a bad MAF.