You wer never suposed to keep Rupture up 24/7.
Rupture is done ONLY if you get a T10 4/5 proc, or during Overkill buff, or any time in combat where you have more energy than you can spend without overlaping Envenom buff.
For example, if you have 4 combo points on the target, 70 energy and 3 sec left on Envenom buff.
U do Rupture here and continue doing Envenom spam.

