Leica 2400r

I've got a leica 2400r rangefinder that seems to be having trouble with the ehr function, I can range a target fine but wen the rangefinder recalculates the ehr for the angle it doesn't seem to be correct in that it only ever reduces the initial range by a yard or two regardless of how steep the angle is. Would be interested to hear from anyone else using the 2400r that knows if there is more than just the two setting options of euro or us. An also if possible be able to compare rangefinder results at a set range an angle. Ie 600 yrds at 5degrees etc. Cheers