Conid do have different nib assembly collars for Ti and Au now, so the old problems of overtight Ti nibs are gone and the Ti/Au nibs probably fit about the same into the assemblies. I think the feeds are the same between the two nib materials. Maybe it is a physics thing, with Ti being more resistant to capillary flow than gold. Who knows?
It is also possible that the gushing that bothers me has little to do with nib material. I am comparing F Ti nibs to broader Au nibs. The broader nibs will naturally be wetter. Perhaps a B Ti nib would be just as wet as a B Au, and a F Au nib would be ......well, fine. Francis?
Whatever the cause, you'd better like a lot of flow if you get a broad 380. I would prefer Bock manufacture drier nibs because it is much easier to add wetness than to subtract it.
Sorry to hijack the original topic. If this goes any further it should probably be in the nibs thread.