Salaah

Pronouncing kaaf incorrectly

Q: I was reacting tashahud in the first sitting or last sitting (can't remember) of 4 rakat isha salah. I did not pronounce the small "kaaf" when I was reading "wa Rahmatullahi was barakatu" the kaaf of barakatu. So I went back to "wa Rahmatullahi" the recited from there till the end. Is my salah valid?

Doubts with regards to mistakes in Salaah

Q: I have constant waswas.

1. When I am reciting suras in salah or reciting tashahud sometimes the letters do not come out loud enough so I can hear. Is my Salaah still valid?

2. If I make a mistake in reciting in Salah how far do I go back to correct myself. Do I restart from one whole verse or just from where I made the mistake.

3. In tashahud I didn't say "warahmatullah hi barakatu" properly, so I went back to that bit and recited it again. Is the salaah valid?

The time of ishraaq Salaah

Q:

1. When does the time of Ishraaq end?

2. A person engages in Zikr after Fajr Salaah till the commencement of Ishraaq. He stops his Zikr, performs his Ishraaq at this earliest time, and thereafter resumes his Zikr until completion. Will it be better for him to complete all his Zikr first, and then perform his Ishraaq Salaah? Or will it be better to pause his Zikr and perform Ishraaq at the earliest time?