Its to be expected with the clutch, I had to change mine with less than 50K on the clock. The Helix upgrade from AKS will more than handle what you throw at it. Fitting you'd be looking at a couple hundred for labour at a guess.
As for the surging, I'd leave it to be honest, as reducing the boost reduces the surge but will reduce performance too. Car will be fine, the K04s seem to take pretty much everything you can throw at them
