Method of Salaah

Levelling the back in ruku'

Q: Further to your advice that arms should be fully stretched during ruku' in Salat, please advise me further. I am a tall person with long arms, therefore in ruku' my back does not become horizontal without slightly bending my elbows. Am I excused from levelling by back, or it is not a requirement at all?

Reciting a Surah in the third and fourth rakaat after Surah faatiha in the four rakaats sunnat of zuhr

Q: I just wanna ask about the sunnat-e-muakadah before fardh of zuhr. I should perform it with salaam at the end and now my question is on the third rakaat am I only going to recite fatiha and also in the forth rakaat just like praying fardh or I should recite another surah in the third rakaat and another surah in the last rakaat after faatiha?

Reciting behind the Imaam

Q:

1. I just want to ask in the zuhr and asr salaah when you are behind the Imam are you going to recite the surah fatiha and then after fatiha do I need to recite another surah? Or only the surah fatiha?

2. Another question of mine in magrib and isha salaah on the first and second rakaat after we say ameen behind the imam, do I need to repeat the surah
fatiha silently while the imam is reciting another surah? I follow Abu Hanifa.