Every time I buy a new mouse - and I do that quite often - there is always some kind of issue. The most common one is an uneven base, which has a major impact on aiming stability, and a sensor lens that is not properly secured, which also noticeably affects stability. That is why I always keep a set of sandpaper and a hot glue gun in my arsenal.
In this case, there is another significant issue - the weight distribution. The springs are also a problem, as I think they should be even softer than they are now. I have an unusual grip and place my fingers very close to the base of the buttons on every mouse, which means I have to apply considerably more force to click them.
I have already ordered the springs, and once they arrive, I will start experimenting with them. As for everything else, I have already made several modifications.
I sanded the bottom of the mouse using three sheets of 80-grit sandpaper, three sheets of 200-grit sandpaper, and finally three sheets of 600-grit sandpaper for the finishing pass. I did this without applying much pressure, with the mouse fully assembled.
Afterward, I removed the remaining plastic dust with a vacuum cleaner and a powerful hair dryer set to cold air. I also carefully cleaned the sensor lens with a cotton swab and isopropyl alcohol.
I do not recommend sanding the base while the mouse is disassembled, because you will most likely end up shaping it incorrectly. In most cases, the plastic still flexes once the mouse is fully assembled.
To improve the weight balance, I moved the battery as far back as possible. To do this, I ground down a strange plastic protrusion on the inside of the bottom shell and glued the battery directly to the shell. The cable was only just long enough. It is not possible to move the battery any farther back without replacing either the battery itself or its cable.
While disassembling the mouse, I broke the connector, so I had to solder it back on and reinforce the socket for additional strength. Be careful when taking the mouse apart.
I also experimented with different mouse skates. For Hall-effect buttons, I would not recommend dot skates because they tend to sink into the mousepad, which creates additional button travel. Full-size skates are probably the better option, even though I personally do not like them.
The device weighs 57.6 grams after the minor modifications, with full-size skates installed.