Wow, I haven't heard that Only Begotten Son in quite a while. Very nice, Nektarios, this is just like liturgies you find in my area of the world outside the Russians (OCA) and Greeks and Antiochians. Same singing. The Slavonic has fallen away a good bit and most of the prostopinije is conducive to singing in Slavonic not English. When things are done in Slavonic the people sing so loud. It is usually the diak that resists the Slavonic these days.
I can see liturgical/rubric differences. The Greek Catholics (byzcaths included) sing "God Grant you many years" when the bishop blesses with the trikiri and dikiri instead of Eis polla eti despota.
Wow, same tones and everything as here, and fyi, the four UOC churches in my area all use service books for certain things from ACROD and it is a mix of Galacian and Prostopinije. The ACROD here is strictly Prostopinije but some use choral as well, but not the one near me.
I wish the ACROD would re-institute the small litanies between antiphons. They need to re-institute the three litanies after the Gospel, especially the litany of catechumens. They need to put their curtains back up behind the royal doors. At least ACROD uses the silent epeclesis as does the UOC.