We do, and I believe Piers may be marketing some as well, but I haven't asked him.
The ones we have are available in several levels above DD3's.
They are made for us by a well-established company in the midwest.
Not all EDM injectors are the same, some keep 7 holes but enlarge them, others go with more holes.
Don M has been doing a lot of research and building of injectors, I think a lot of us would be glad to see what he comes out with.
A word to the wise: One should always keep in mind the extensive amount of quality research that Diesel Dynamics has done regarding 24 valve injectors. They have VERY good reasons for offering the levels and types that they do.
Anything beyond that, you are at risk for serious engine damage.