It is said about Rabi Akiva that he would begin davening in one corner of a bais medrash, and finish in the opposite corner, but when shaliach tzibbur, he did not do this, meaning, one’s kavana should not be dependent on anything. I, personally don;t shukel, as my rebbi did not, and he described his rebbi davening as “a shtekel holtz”. For concentration exercise, I sometimes daven in Sfardi bet knesset, where there is a constant chatter from the shatz. This helps me, I cannot be disturbed by “other chatter” or. someone’s shukeling. Air raid sirens are still a problem, but not a big one.
