Try this one Thomas: go with the weight that moves like an empty bar, with the caveat that you're pushing maximally each rep. That's BoM speed work. Then add a little bar weight, Maybe a ten on each side, or a ten and a five. That's a good number for raw.
You especially don't need to go as light when you're beginning to use speed work or don't have a huge raw bench. You need to attune to the intent of speed day and let yourself get used to it. Kind of a transition into pure speed (it actually is still classified as strength/speed). I'm of the belief that pure speed can benefit raw (not as much as it does gear, obviously), but it happens over a very big timeline. Measured in months rather than weeks. But the intent must be learned first.