Yeah, funny how an engine makes a difference in how easy it is to move a motorcycle...If a 130-pound kid can jump a 270-pound 450 over a 40-50 foot step-up, then I think a 160 lb adult can handle a 45 lb DH bike. Just a hunch.
And Iridebikes - easy enough to slack the Sunday out, lower the stanchions in the crowns...
Have you ridden one, or are you just basing your worries about headtube angle on previous bikes you've ridden?