I get that the whole symbology thing of Revelation has taken centuries of building, but something that has arisen of late is that John, the writer of Revelation, was a Jewish/Hebrew man. Considering that his dad, Zebedee had connections with the high priest, he may have had levitical training.
Remember, according to the law, it was incumbent on Jewish parents to train their children in the law.
As such, what we view today as symbolism, they would have learned out of the law and prophets.
In reading the laws and prophets over the years, I'm seeing plenty of evidence of this theme.
So, instead of trying to make it out to be more symbolic, read the prophets.
They're not as intimidating as they have been made out to be. There's actually some really great stuff in them.