Of all the key caps I have tested and used with the VA87M, I feel the SA Industrial is the best keps with the keyboard. This is an old setup and I have long sold both they keyboard and the key set.
This my Varmilo VA87M was using an aluminum case off taobao and I felt the difference between aluminum and the original plastic case. The sound was more pronounced and solid and not hollow like when I was using the plastic case with it.
The board also came with Cherry MX Brown switches with felt really great with the SA industrial set.
Hope you enjoy the album below