Mark, yes I got your PM and email. Sorry, been very busy.
The Optoma does have a DVI-D input, it's just integrated into it's DVI-I connection. I think you are getting them confused. A DVI-D is actually limiting w/ connection possibilities and the DVI-I is the better choice. With DVI-I it can accept both analog and digital RGB signals, with DVI-D it is limited to only digital RGB.
For DVI-I, look at the connectors and do you see the extra 4 pins around the center pin that's located to one side??? These carry the analog RGBS signals. DVI-D doesn't have them.
It is also a better option for manufacturers to use a DVI-I connector on their products because then either a DVI-D or DVI-I cable will work with it, making it easier on the consumer. Try connecting a DVI-I cable into a DVI-D connection...ain't gonna work...unless you break off some pins
I have used the EVu system and I bet that's the problem. The HD signals are compressed badly, plus 1080i isn't the best choice for fast motion, especially sports. Yes, the EVu 6000 can output a 1080i signal at 720p. I don't think it will help though as it is most likely in the source.