Hi Krish,
I used to only do Sambhavi during SBP at first because it was too distracting to do it during meditation, but what I found over time was that it became as Anada says, automatic. I have come to personally think that almost all of the practices other than meditation should only be added once they become automatic. The reason I say this is because for many months I have been doing SBP and other mudras and bandhas, but not until they started to happen without any intention did I get the feeling that they were "working". Only recently has SBP, sambhavi mudra, nauli kriya, uddiyana and mulu bandha become automatic. And only since they started to become automatic have I felt that they are truly doing what they are meant to be doing. So in my personal opinion (and please take it as such as I still very much a beginner and end up contradicting my own opinions all the time) leave the mudras and bandhas alone until you feel them happening on their own. Focus on DM and inner silence and the rest will fall into place. Someone, please correct me if this is totally wrong and should not have been said. Thanks.
Love,
Carson[^]