http://revach.net/article.php?id=4732

Section: Parshas HaShavua   Category: Quick Vort
Parshas Ki Savo: Ben Ish Chai - Bypassing The Bracha Of The Malachim
הַשְׁקִיפָה מִמְּעוֹן קָדְשְׁךָ מִן-הַשָּׁמַיִם, וּבָרֵךְ אֶת-עַמְּךָ אֶת-יִשְׂרָאֵל, Look forth from Your holy habitation, from heaven, and bless Your nation Yisrael (Ki Savo 26:15).  The Gemara (Chagiga 12b) says that there are seven heavens.  Ma'on is the fifth.  Why do we ask Hashem to look down specifically from Ma'on to give us a Bracha?  Why not from the top heaven?

The Ben Ish Chai answers that the Gemara says that in Ma'on there are Malachim that say Shira at night.  By day these Malachim are silent in deference to  Bnei Yisrael who praise Hashem by day.  This phenomenon proves that the greatness of Klal Yisrael is greater then even the Malachim, who honor Hashem by silencing themselves during our Shira.

When we tell Hashem, "Hashkifa, look down and give us a Bracha," we want Hashem to bless us directly and not through the Malachim.  We, therefore, tell Hashem to bless us from Ma'on, as the silence in Ma'on proves we are on a loftier level than the Malachim, and it is improper for them to serve as the conduit of our bracha.