The Wildeblood.Docked_HUDs 1.3.1 and Wildefire_Docked_HUDs v1.1 both use the same identifier: oolite.hud.data.Wildeblood.Docked_HUDs
So, the only real difference is in the filename. Wildeblood.Docked_HUDs 1.3.1 is the updated version of Wildefire_Docked_HUDs v1.1, and thus is the one you should be using.
As for any issues with Elite Trader, I suspect those are best dealt with inside Elite Trader, rather than Docked HUDs. My suspicion, without having looked at the code, is that the problem is with Elite Trader not understanding there might be other HUD's activated, and not doing a good job of ceding control.