You may have better luck with the GT2's. His biggest complaint was the front tire catching road fractures and the rain drainage groves on the highways. Even the service manager was concerned and that's why he replaced them with the GT's.I have mainly had Angel GT A fitted for the past 4 years on my K1300S - 3 sets.
Then I decided to try the Roadtech 01, but in my opinion they're not quite as good as the Angels. They're more sensitive to the UK road surfaces than the Angels, and also don't have quite the same completely solid feeling went leant right that the Angel has. However, they're not bad - just not as good.
The Roadtecs ran out (7k miles - pretty good life), so I've put an Angel GT2 A pair on about 500 miles ago. They're definitely better than the Roadtec 01s in my opinion. It's difficult to say whether the new Angels are better than the original Angel GTs - 7k was quite a while ago.