Salaah

Q: If the ahle hadith wash their feet with water during wuzu after taking their socks off can we offer salah behind them?

Q: Is there any Saheeh daleel that Rasulullah (Salallahu Alihi Waslam) and the Sahaba (Radiyallahu Anhum) prayed eight rakat taraweeh? Is taraweeh and tahajjud different salat to be prayed in one night?

Q:

1. I went to sujood. My finger was on something, so before reciting anything I flicked it away and put palm flat and carried on.
2. In third rak'ah I rose from sujood and like in the position where you support yourself to get up I moved my left foot flat and realised its not sitting before getting into it and moved my foot back upwards and supported myself up like about 10 seconds from sujood takbir to the basmalah of 4 rak'ah.
3. Disc solid small spot, not paint, perhaps likely a eye secretion under my eyelid at about 6:30, I made Wudoo' at about 5 to 4 (3:55) and was done with Fajr at perhaps 5:15. (I was awake for Dhuhr all way to &past fajr), should I disregard it as having come later and ignore it?

Q: Sometimes in rukoo' I do the thikr and then I straighten myself a bit and hear a crack, so does that mean my back only became straight when it cracked? If so do I do the thikr again? Must the back in sujood rukoo sitting and standing always be straight or at ease straight? Is the neck or head considered in this?

Q: Majority of the time when I do sujood, my little toe doesn't touch the ground and perhaps the two besides it, but the big toe and one next to it  mostly do if not all do, so, is all toes touching the ground with pressure waajib/Fard, if so should one make movements in sujood or seating to ensure they touch the ground? Also I am not able to remember all the times this has happened, a lot though.

Q: What is the ruling on reciting inaudibly, is there a consensus on its permissibility? Like without noise and just moving the tongue.

Q: I usually read my witr salaah at the time of tahajjud, after the tahajjud salaah. However, sometimes by the time I finish my witr the fajr time has set in. Will this be regarded as qadha? Will I have to repeat it? Will it be better for me to read the witr before sleeping?

Q: If you travelling for Umrah and spend 7 days in Madinah and 7 days in Makkah are you a Musafir? Do you perform qasr salaat when on route and
performing alone. I understand you will follow the Imaam when in the Masjid. Do you have to perform the Sunnat of the salaat?

Q: How should a person perform Salaah if he has a back problem? Can he sit on a chair and perform Salaah? I was told that if he does not have a serious back problem and performs Salaah on a chair, his Salaah will not be valid. It this correct?

Q: If a person did not repeat the words of the Azaan immediately after the muazzin but only remembered at the end of the azaan at the time when the muazzin reached Hayya Alal Falaah, can he repeat the words from the beginning of the azaan or he should only repeat the words of the muazzin from hayya alal falaah?