Unfortunately, it is so difficult to obtain samples of genuine coins of this period, or of earlier coins, that any one collector or researcher studying these edge varieties by himself (or herself) is almost doomed to failure. How many collectors of Russian gold coins can afford to build complete sets according to date and variety?? Might as well plan a vacation trip to the moon! But together, we can perhaps do significant research by sharing pictures of the edges of our coins.
Here's a start: six images of four stacked coins, all gold 10 rouble coins, from top to bottom by year and mintmaster:
1911-ЭБ
1904-АР
1901-АР
1900-ФЗ
Each image shows a different aspect of the edge lettering as the view rotates around the entire diameter of the coins:






As you can see, there are important differences in the letter spacing, and sometimes in the shape of the lettering. I have some more of these which I haven't photographed yet -- 1902, 1903 and (hopefully soon) all three varieties of 1899 (hopefully genuine!)
The coins pictured above are not slabbed, but all are presumably genuine, as they weigh in at 8.6 grams and otherwise have no features which might distinguish them as fakes. But one can never be sure! At least they are not in a slab so we can actually see the edges of the coins.
Looking forward to seeing more pictures of the "third side" of your coins (silver as well!)