Test drive reviews are always fun! I've had my EB for 8 months now, and it has met or exceeded all expectations. Tows the pants off my GM 5.3's, that is for sure, and gets 5-10% better mpgs under similar situations.
But just a couple issues w/ your observations. According to power curves of the EB and 5.0, the EB is generating around 100 more hp at just about every point between 1800 and 3000 rpms or so. Of course, 'feel' is subjective, but I don't understand how the EB could feel less powerful under 3k rpms. Seems you have it backwards -- the EB is far more powerful than the 5.0 under 3k rpm, at which point the 5.0 starts to catch up.
Although I haven't driven a 5.0 for any meaningful amount of time, that is certainly the case when compared to my GM 5.3. I feel like I have to push a lot harder on the right pedal when I get out of my F150 and in to the family Suburban, that is for sure. Just my own observations.