Rack,
I have mine in front of me right now and after REALLY looking at it I don' t think " Filing" the right side of the launcher will be necessary.........It looks like it will probably sit OK. The arms of the launcher actually have an upward " sweep" to them and it' s gonna be close, but that right one might not contact the riser at all.
Not sure if I' m explaining it well enough..........even if the center of the launcher is laying flush on the arrow shelf, the arms of the cradle will still be raised up a bit because of that sweep.
I think you might be OK. (I have mine tuned and I' m not moving it to check!

)
Where I have mine is just BARELY off the edge of the shelf.........in this position the natural built in " Low" point of the launcher travel brings everything ,arm tips and all, below the height of the shelf. Yours will just have them sticking up a bit because of the natural built in curve.....but i doubt they will interfere.
Also.......even if you have to mount the cardle back off the shelf just a tiny bit, don' t worry about the " Overdraw Effect" at all. Who says that you have to cut your arrows right to the end of your arrow launcher? If you shoot the same arrows that you were planning on shooting with the launcher on the shelf there is no concern at all.........the tip of the arrow is still gonna be in the same exact spot at full draw. And these drop away rests don' t behave like the old static prong style overdraws in a rearward position anyway.
If you bought the short armed version then all of this is probably moot anyway, because I don' t think that you' ll be able to get it back far enough to be off the shelf anyway.
So bottom line of all this babbling is that I think you are gonna be " OK"

[8D] You' ll just have the tips of the launcher sticking up a bit ,but they should be well out of the way.