Preforming wrong actions and then confessing them and so forth is like drinking poison and then drinking the antidote.
"Since you greatly extend the time needed to attain such things as knowledge of the path, strive not to be tarnished by faults from the start. The Buddha said that for this reason noble beings do not consciously engage in even the subtlest of sins or infractions, even for the sake of their own lives. If it was the case that purity through confession was similar to faults that have never taken place, then there would be no need to act in this way."
-Lam Rim Chen Mo eng v01 pg. 257 tib pg 201
Doing a 24 hour per day Vipassana retreat instead of seven Medicine Buddha mantras a day is wrong action??? Chill out dude! I am sure that if they talk to the lama that gave them the samaya, that they will be quite happy for TaTa to "make up" for the whole 7 mantra a day that they "missed out" on during the course of the retreat. I'm also sure that Sangye Menla won't mind that TaTa spent 10 days practicing like a lunatic in order to better benefit sentient beings.
Vows are taken to affect ones mind stream in a positive manner, if the vow is "broken" for a greater positive effect then the intention behind the vow has not been broken. ie no infraction. Vows are not about guilt trips. Chill out!