Got back from a round trip down south and up the West Coast with the parents last week, clocking up around 2,400km across 6 days.
Threw in the old stock rear springs beforehand. Whilst it didn't completely eliminate the rubbing, it isolated it to only the harshest dips in the road when catching them at high speeds, but overall much better and meant I could drive with way less stress and way more confidence. Considering this was the first road trip I've taken the car on with 4 adults and a bootful of luggage on board, I can't really complain about the little rubbing still remaining. This was an outlier of a situation and with 1-2 people on board, I don't think rubbing will be an issue on the stock springs.
Some absolutely amazing roads out there and an absolute ideal place to put the car through a proper stress test after the big rebuild. Some small issues aside, the car performed perfectly and effortlessly ate up the km's. Queenstown - Glenorchy is still my favourite bit of road in the country but also enjoyed experiencing the Queenstown - Te Anau and Wanaka - Haast routes for the first time ever. The folks loved their first time in NZ as well, saying it felt like they've been to 5 different countries in the short time here, such was the variety of landscapes behind every new mountain ridge. Good good times.