I do not know what "back-to-back" run means in this context.
Since you are a sentient human being please look up "heat after death" at LENR-CANR.org.
Back to back means that we has had event today. The next day we followed the protocol and we did get had. The following day we also followed the protocol and we got HAD event . And so on. One off event belongs to urban legends category you know this, Jed.