So then the problem wasn't the fill but the improperly maintained equipment. My girlfriend routinely uses a HP130 with a yoke reg and has never had a problem. I've also had fills to 3800 and not had a problem with my DIN regs.
It's hard to (inexpensively) detect a weakened hose without destructive testing but most o-ring failures are due to either improper maintenance or the wrong o-ring in the first place, not overpressure.
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