Abelleh: You do have an interesting collection of minhagim.
1)Why? (Not doubting you, just curious)
2-3) I do those too. To be meikel seems like a bit of a “drei.”
4) R’ Chaim didn’t fast, but AFAIK his own sons did.
5) That is most definitely not the minhag of any bnei ashkenaz. If these are all family minhagim as opposed to personal you have pretty interesting yichus.
6) See 1
7) What?! You do that too?! 😛
8) Chabad has a variation of that. The men don’t use any eruvin, including ones they admit are kosher, but allow their wives and kids to use the kosher ones.