just curious though, what kind of heat are you experiencing when combining the a'mal in ramadhan ? I am not an expert on adzkar, hence I am not the right person to advise. However, I do know that the 300 tasbeehaat (4 kalimahs, darood, istighfaar) are being prescribed by tablighi mashaikh to be made in the morning and evening. And this tasbeehaat is for general people. In malaysia we call it dzikir awwaami (ie general dzikir for public). It is a balanced dzikir and not too taxing/burden for the public/layman muslim. I do not know anything about the Momin ka Hathiyar and the other wazaif that you do. I guess Im not of much help here. wallaahu a'lam