That is pretty much as expected. The straight Russian genetics is more sour.
Not sure the reason most are smaller?
I bought one gallon plants of 2 of the Japanese kind in 2012 (Blue Moon and Blue Velvet), and sold them for ‘edible landscaping’…but I did get to taste some of them a year or more later. I liked them, even if probably a little underripe as the birds had found them.
Later I bought Tundra and one other I have forgot…the Tundra I liked but it didn’t bear much.
Either I sold it or it died. Currently I’ve got one or more of Aurora, Beauty, Beast, Honeybee, Tana, Giants Heart (Berries Unlimited) and I think one other from Dr. Thompsons cultivars. Indigo Gem and Blizzard died…being tiny plants.
Did you save seed this year? I didn’t have enough fruit.
And at least one Aurora has buds expanding since yesterday…as it’s been a 45 degree spike in our temperatures since 2 days ago.