You are getting there.
My Decklist still would cut out both Luminous Angel and replace them by 3 Blinding Angels though.
Against unbalanced Beatdown you will most likely win after playing a Blinding Angel or Holy Day Scepter.
Make sure to have more Artifact Regeneration in your sideboard (i.e. Welding Jar against Artifact-Hate matchups).
You removed the Mirror Gallery from your Maindeck. OK. But not having a Mirror Gallery makes 4 Umezawa's Jitte way too much. Either play 4 Jitte's with some Gallery or play some Jitte's only (~2 - you still have 4 Steelshaper's Gifts to browse for them, thats like 6 Jitte's in the Maindeck, and you have 1 left in the library if an opponent destroys your first Jitte.)
If you think of the Blinding Angel as an option then you need more Prevention for Direct Damage. Holy Day and Ethereal Haze are good for the Scepter, but they can't protect the Angel from Dir.Dmg.
The Shining Shoals then have to be kept on the hand for the case the Blinding Angel is ever targetted by Direct Damage, they just make no sense in the Scepter though. - Think of a Test of Faith, Hallow, Mending Hands or Healing Salve here for the Sideboard, that would be a great help if your opponent is playing Red Deck Wins. All these 4 Cards have a Synergy with the Scepter as well.
I think thats it. Think of these changes, get a sideboard for the current Standard metagame and next time be somewhere in the Top3 of your Tournament. heh