But you need 8 of them to get a second bonus. And there's room for just 6. So remove 2 useless speed mods and add 2 health/potency'tenacity/defense mods and then you'll have another bonus.
You can only get one set bonus from speed mods since the bonus requires 4. Best to use 4 speed mods and then fill the other two slots with a type that only requires 2 for a set bonus.
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If you click on that icon you will see that speed mods requires 4 mods for bonus...some other require 2
you need 8 for double bonus, wich is impossible.