First check the trigger and make sure it's not sitting right on the activation point and has some free play between fire - rest and full pull points. Check that the spring is stiff enough to do the job of keeping the trig. of the switch when you bump the marker. If all that is fine, move the debounce to 10 and see how it acts.
CHANGE one thing at a time and see how it effects the overall action.
Even when you can't see Him... God IS there...
<>< †ChRiST KreW† ><>