From the OP’s questions, like what do you gain from davening slowly and not quickly or what’s the latest time you can come & earliest time you can leave, I get the impression that he’s not being genuine. But I will share a story of the Chofetz Chaim who used to go around towns selling his seforim. In one shul after shacharis a guy who had come late was ‘catching up’. Why are you saying so much davening asked the CC? I am being mashlim my chovos the guy replied. Said the CC its not kedai to have chovos by the ribono shel olam.
BTW you mentioned bizyonos towards the tzibbur… What about the bizyonos towards the RBSH”O and YOURSELF?