NH bred horses are an entirely different animal to flat breds in terms of what they can handle.
Kelso climbs to its highest point as they go away from the stands/winning-post, and the run-in is on the level....and possibly even slightly downhill. Chepstow would be another example of the high-point of the track being beyond the winning line.
Presumably, the elevation change/rising ground matters most if it is an uphill finish, rather than there being an uphill pull somewhere else on the course?