I could see the argument to run Sacred Foundry and perhaps some number of mountains to give you access to Chained to the Rocks. But I see a few issues:
1) I'm seeing is the lack of power outside of Archangel and Elspeth. One of the strengths of the white weenie decks is that they will overwhelm you with a TON of 1 and 2 cost creatures. This lets you get away with them all being 1 or 2 (maybe 3) power because you have 4-6 of them many times and are swinging for substantial life totals. Here you have only 8 creatures at the low end of the spectrum but then have 8 at the three drop, none of which has more than 2 power. Personally, I would advocate to move either 2x of both Banisher and Fiendslayer to the SB or perhaps all four of one to the board in favor of Soldier of the Pantheon - he has his own life-gain trigger AND gives you a much more aggressive start (pro multi-color is also relevant).
2) What exactly is the plan against a non-creature Erebos? I can see this deck struggling against a lot of black strategies. Further, against control, only 2 Boros Charms (3 if you side the other one in) doesn't give you the best odds to survive a board wipe (which they're likely to do given their number of draw spells). Thoughts?
3) Why 3x Arrest? Pacifism does the combat bit for less and if you're worried about activated abilities, that's what Pithing Needle in the SB is for.
4) Isn't Elspeth rather counter to the whole idea of your pumping creatures? I get that she wins games on her own and is nasty and all, but you've completely invalidated her -3 as it will likely end up dropping a lot of your guys in the process. Perhaps she is a SB piece more than anything?
5) If you're going the devotion route, no Heliod at all?
6) If you were open to multiple colors, I actually ran against an interesting Naya tokens build a few days back that strikes me as a great option to run here... the simple combination of Trostani, Selesnya's Voice with Assemble the Legion would make Archangel hilarious.
7) How has Soulmender performed? I was intrigued at the Archangel - Mender combo when they were spoiling M14, but I can't get over the nagging feeling that he has to be underperforming for you.
I hope some of this helps...