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A decent tune will cost less than most bolt-ons.
OP does have a point with the computer working to account for altitude by increasing boost. The problem comes with the intercooler. The turbo can be turned up to cram more of that thin air into the engine, but can't do squat about the air crossing the intercooler. That charge air isn't being cooled properly at altitude to truly match the power at sea level.
If OP is absolutely against a tune to recoup the lost power at altitude, an upgraded intercooler will be the best bolt-on to help him out.
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