Problems with reflections - try combining more captures with different reflections. One reflection to one part, another reflection to anothers.
Velvet - light sucker.
More objects behave as a group - reflections, lights, shadows, …
For perfect background, we need to backlight it.
Make shape with light sources (keep in mind light shape - square, elipsis, …) eg. ephasise soft curve with square shaped light (softbox).
Rotate softbox to adjust reflections. (Closeer light -> bigger reflection).
Sequentely build light scene and compare photos on computer.
Light table - fixed specular
Light tent - very diffused
For product photos, use tethered shooting and check photos on big screen.
When finished perfect scene, try to add some variations. Even just for parts - combine them in Photoshop.