I'm gonna be getting blown shortly!!!
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Idle hunt could be a vacuum leak?
Get some high concentrated dish soap and water in a bottle and check.
Can’t help you with all the other stuff. Looks great in the bay.
belt route could matter for belt longevity, but i don't think it would make more boost because it's routed wrong -- unless you change the 'gearing' somehow like on a bike, bigger up front or lower in the back for more speed per rpm.
back in the day (90s hondas) a surging idle could be FITV or low coolant, not sure if that applies on your model.
What are you using for management?
How many miles on the motor?
How aggressive of a pulley will you go with next?
(stock internals with 11.0:1 compression?)
There's nothing wrong with KTuner. It may not be a flagship product, but it works fine. The tuner just isn't used to it most likely. If it was crap, phearable wouldn't be using it to make crazy numbers on these 1.5T's