Virtues

Practicing on Dhaeef Ahaadith regarding virtuous deeds and actions

Q: Are daif hadeeth virtues of surahs and adhkar 100% guaranteed or one can hope that after doing them Allah will give them and can one just stick to sahih and hasan hadeeth like virtues of surahs baqarah and imran that whoever recites them they will intercede for him and hasan hadeeth like surah mulk. 

There are some daif hadeeth like recitation of certain surahs in night like surah Yaseen, Dukhan, Rahman Waqiah and Hadeed, these three surah recitation anytime during day or night on day of qiyamah he will be called from the people of jannatul firdaus. If these daif hadeeth virtues aren't 100% guaranteed, can I stick to daily recitation of one juz and Musabihaat surahs before sleeping along with Surah Mulk and Surah Sajdah.

Virtue of reciting Surah Dukhaan at night

Q: Sayyiduna Abu Hurayrah (radhiyallahu anhu) narrated that Allah's Messenger (sallallahu alaihi wasallam) said, "If anyone recites (the surah) Haa Meem ad-Dukhan in the night, then he will wake up in the morning with seventy thousand angels seeking forgiveness for Him." (Mishkat 2149) 

Now is this virtue for every night or specific to Friday night that is from Thursday Maghrib to the starting time of Fajar of Jumu'ah?

Virtues of reciting Surah Hashr

Q: Surah Hashr - The Messenger of Allah (sallallahu alaihi wasallam) said: Whoever recites Surah Hashr then none from among Paradise, Hell, Arsh (Allah’s Throne) Chair, Curtains, the seven Skies, the Seven earths, space, wind, birds, trees, mountains, Sun, Moon, and angels would miss seeking forgiveness for him and yearning for his safety. If that man dies that day or that night he would die a martyr. 

Is this authentic? Does one have to recite this Surah everyday to get this virtue?