The OP is talking about adjusting the action so that the Low E goes down but the High E stays the same. So he needs to taper the saddle from X height at the Low E to zero at the high E. It's normal to round off a piece when you are sanding it. Switching directions and rotating the piece help with that but in this case you have to be careful. Technically it's probably impossible to not take any off the high E end but you can make it so minimal that it doesn't matter.
What I have found works for me is to hold the piece on the end you want to remove, the low E in this case, and push on the sanding board from that end only. Watch the line constantly and also make sure you are not putting an angle into the bottom of the saddle from front to back. Once you get close move towards holding the saddle more in the middle and keep a mental image of NOT removing material on the High E end.
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