Reciting the beginning and ending verses of Surah Baqarah and making dua after burial

Q: As I understand, after the burial of the deceased, it is Sunnah to recite the beginning verses of Surah Baqarah at the head side and the last verses of Surah Baqarah at the feet side. Additionally, a dua is typically recited. In our practice, we first recite Surah Fatiha, followed by the beginning verses of Surah Baqarah at the head side, and the last verses of Surah Baqarah at the feet side, which are recited loudly so that everyone can hear. My questions are as follows: 

Is it permissible to start with Surah Fatiha? In the narrations, only Surah Baqarah is mentioned, and not Surah Fatiha. 

To what extent is it permissible to recite these verses loudly? 

Afterward, a dua is made facing the Qibla. This dua is a collective, loud dua where the Imam makes the dua aloud and everyone responds with "Ameen." 

My questions regarding this are: Should the dua not be made individually? To what extent is it permissible to make a collective dua after the burial?

Back or chest facing the Ka'bah during tawaaf due to construction barriers

Q: During tawaf on the first floor there are times where construction barriers are blocking off certain areas. It is such that we have to walk diagonally where our shoulder moves away from the Kaabah and it seems like our back is facing the Kaabah (but we can't be certain because we can't see the Kaabah from the first floor). It happens few times during tawaaf. What should we do in this situation?

Doubts in wudhu and ghusl

Q: I was recently diagnosed with OCD, which results in me having a lot of doubts about things. However, I’ve been working on getting better Alhamdulillah. I just had a quick question regarding what to do in the following ghusl/wudhu scenarios: 

(1) In Wudhu, when I wash my face, water also rolls down my arms and also splashes or falls off my face onto my arms. Then when I go to pour water on my arm, I’m not sure which part of my arm is wet with the fresh water or wet with the water that rolled/splashed off my face onto my arm. What to do in this scenario? 

(2) In Ghusl, I often doubt whether water has reached the skin under my beard. I have a beard wash soap, which I usually rub fully into my beard then wash the soap away while rubbing my beard with my hands. Once the soap has been rubbed and washed away from the beard, can I assume that the skin underneath the beard has also been washed? 

(3) In Wudhu I try to just wash 3 times and move on. However sometimes I forget whether I have washed 2 or 3 times. What do in this scenario?