Your issue may be similar to the one that many people have with the Limb Driver rest. If the pivot point of the launcher is not even with the top of the arrow shelf then when in the down position, the launcher sits up at an angle as opposed to laying completely flat on the arrow shelf. This often will cause clearance issues.

The basis for this issue seems to be the location of the berger button and how close it is to the arrow shelf. There is a school of thought that the nock point of the arrow should have the center of the shaft aligned directly through the center of the berger button. This can lead to difficulty in getting clearance with many drop aways and in some cases, clearance issues with the arrow shelf itself.

My suggestion is to set up the rest so the launcher lays flat on the arrow shelf. This normally entails moving the rest up between 1/8" and 1/4". With a level nock point, you will probably find that the bottom of the arrow shaft is in the top 1/3 of the berger button hole (this is where you want to be). Now adjust your rest height to get the correct positioning of your arrow (1/8" nock high is pretty normal).

I have found that nearly most drop away contact issues that can't be attributed to rest timing are caused by this issue. You should also notice that with the launcher laying flat, your rest timing should be far less critical than it had been in the past.

Hope this helps.