are you sure it's elevation that's off, or is it azimuth?... or is it maybe that the pole isn't 100% plumb? If it's just that it's 1 or 2 off it azimuth, changing location in the receiver's usals or 1.2 to match could help - for instance on my dish, wind or some birds or something knocked me out of alignment, so now stuff like 123 is actually 121.5, and the rest of the arc is about 1.5 degrees off too - enough to be annoying, but not enough to lose signals and want me to manually adjust stuff by hand since every time I do that I seem to lose the arc a little til I spend half a day redoing it all. Right now, I'm getting 60 percent on weaker tps and 99% on decent tps that are on pretty weak signal'd birds, so I really don't want to screw things up by hand. Instead I just adjust the usals, changing the nubmers to match the 1.5 degree difference on all birds. Probably not the "best" solution, but given that I spent a whole couple of 2 day weekend a month or two back getting it all just right, I really, really, really don't want to screw up the stuff by manually adjusting the dish to thow it off of the arc.
If it's elevation that's off on east/west parts of arc, check your pole.. make darn sure it's plumb.