Method of Salaah

Q: What is the correct way of reciting solatul-ibrahim?

Q: I recite dua in jalsah (sitting between 2 sajdahs) as per hadith "Allahum magfirli warhamni wajburni warfaani wahdini wa aafini warzuqni". I like to add these words to this dua "wa aauzu bika min kulli balaa id-duniya wa azaabil aakhirah".

I would like to know if adding these words in the dua is permissible or not? 

Q: Should we recite At-tahiyat and Durood e Ibrahim with Tajweed? With Ghunna and everything?

Q: If due to sensitivity, the microphone picks up the Imam's voice in the 3rd and 4th rakaat of Zuhr, Asr, Esha and in the 3rd rakaat of Maghrib, does that count as having made Qiraat in a loud voice? Is Sajdah Sahw wajib? Please note that the Imam is not intentionally doing so... He is keeping the voice low but the mic picks it up.

Q: How loud can a person recite Quraan in salaah like in a fardh or sunnah salaah? How loud should a person recite when he is performing salaah individually in his room, etc. in a jehri or sirrri salaah? 

Q: Is saying Aameen after Surah Fatiha in namaz correct? Someone had written that saying Aameen invalidates the salaah. 

Q: Can we read these duas in fardh salaah:

Dua between the 2 sajdahs and حمدا کثیرا طیبا مبارکا فیه after raising from ruku? Or are they to be read in sunnah and nafil salah only

Q: What is the shar'ee ruling in the case where the Imaam recited the same surah in both rakaats of a fardh salaah? Will sajdah sahw be waajib?

Q:

1. In the witr prayer, is it makrooh tahreemi, makrooh tanzeehi, or permissible to recite a surah in the third rakat which is longer by three verses or more than the surah which was recited in the first rakat and is it makrooh tahreemi, makrooh tanzeehi, or permissible to recite a surah in the third rakat which is longer by three verses or more than the surah which was recited in the second rakat?

2. In a fard prayer or in a wajib prayer, if two surahs have the same number of verses but not the same number of words then would it be makrooh tahreemi, makrooh tanzeehi, or permissible to recite the surah which has less words in the first rakat and to recite the surah which has more words in the second rakat?

Q: How does one humble oneself in salaah?