I've seen people come and go, trying to make a central Gallente organization. There just seems to be something about the Fed that doesn't hold people. It's an issue that other empires have, but it usually isn't quite so problematic.
It might be that a lot of people like to be an anti-hero, and the image the Fed presents is just a little too 'good', without a compelling cause (like slavery) to rally behind.
I think it is more possible to have a fringe or extremist position within the spectrum of what might believable be Fed-related than other empires, though. More possible in that there might be more variety.
A Gallente flavor of Sani Sabik, Anti-government (particularly after the disenfranchisement), anti-immigration (or even nastier kinds of nationalism hiding behind that facade), more moderate but still fervent opposition to external (particularly Republic? and of course those darn Caldari stations) links. Hell, neo-monarchists. Etc.
Now, I don't know that a polarizing position would help, just a thought about what might be tried.
There are, also, several fairly successful Gallente corps (Strix, several 'RP-lite' FW corps), so it might be that the perception there is no Gallente 'bloc' is more that they just aren't seen around a lot.
In fact, thinking about it, I think it is a surprisingly good reflection of, at least my idea, of Gallente society. There is no block because of course there are factors dividing everyone. Yet many (most?) still work for the good of the Fed, in their various ways. They don't agree and fall in line because that isn't required of them by the Fed, that kind of thing.