I haven't had a rupture as you discuss. But I've started using 2 turns of thread tape on the connection between keg liner and black connector. Not the thinner white plumbers thread tape, the slightly thicker pink stuff. My theory on foaming is the pressurised air is getting through the gaps between the quite coarse threads. Sometimes the tightening of the connections is sufficient to prevent this, sometimes not resulting in the air entry into the beer path. The thread tape should shut this down. Its too early to tell if this is doing anything, I'll need quite a number of successful pours for any confidence, I've luckily only had 1 foaming pour in first 5 (prior to taping). The tape does seem to reduce my double threading so it at least has some benefit for me. Cheers.