Hi Phil, welcome to the Forum.
Your topic is of interest to me so I've done some research. It would seem that Aruba alloys have a poor reputation for cracking. That said, they are available in either a cast alloy or a forged alloy, the latter of which is an 'Aruba Performance' and is reputed to be stronger than the cast option. Not sure how you tell the difference mind, you'll need expert advice on that (or a more knowledgeable Forum contributor).
So, if you stick with Aruba then you need the forged variety. Otherwise you could change to another style or you could step down to 17" wheels and have higher profile tyres that are likely to tolerate more abuse and give a softer ride. Either way, perhaps a chat with your local wheel/tyre specialist would be useful.
Tyre option graphic attached. Hope this helps.