Well Koni make adjustable dampers, worth considering as a start point to allow adjustability. Bilstein struts aren't adjustable until you go to their coilover range. I haven't been in the 6R polo to know how it rides and whilst I'm happy with the ride of my bilstein/H&R set-up, it's not well suited to B roads as it lacks wheel travel - so best to avoid a lowered spring as to retain travel. My H&R coilover'd car actually rides the undulations better and doesn't hit the bump stops on big hits.
You may be able to get away with a softer spring (say a progressive spring rather than linear) and retain the current struts, King springs are made locally and can be custom made.
Best to chat with some suspension specialist as to the best approach.
As for tunes, that's a can of worms. What I would encourage with whoever you go with, and ensure they do it, is to log the car, ideally before, but at the least after being tuned so you can see what your boost levels are, AFR and fuel trims, timing, etc. The tuner may not want you running off with print outs of that data, but should be happy to discuss it with you so you know what parameters have changed and by how much. Plus gives you somewhat of a health check of your engine.
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