I solved the problem of weight by disassembling and throwing out both loads. For disassembly, I had to pry off both sliding stickers, under them there are 2 screws. Inside, 2 weights are screwed. Without them, it has a completely normal weight for an optical mouse. In terms of size and ergonomics - for me it is large, it is not very convenient to reach the two front rows of side buttons. But these are already individual features. Although for such a price it would be nice to make some adjustments to the size / shape of the mouse.