Thanks to both multimedia and TheoryCrafter for the suggestions.

A few of them I've acted on, for example, I didn't realise I couldn't use multiple Legion Angel in sideboard, and then Seraph Sanctuary, plus replacing Unmake with the Strictly better Utter End.

Added a Hedron Archive for more ramp, and Divine Visitation (a card I had already and was figuring out which deck to put in), along with another token generator in Dramatic Finale.

However, every addition I've made for your suggestions is just cards I already had (or found randomly when looking through my now 10 year old collection and forgot/didn't know I owned).

For the rest, though I agree with some of them on a concept level, including some of the lower power angels, my friend already has an angel deck and I'm trying to make mine slightly different from hers so as to not have overlap, so some of this was a conscious choice to be different, or some cases, I simply don't have more copies of the cards and don't want to buy more (HI Arcane Signet/Phyrexian Arena.

Again, thanks for your suggestions :)