to reset to factory settings simply choose one of the present modes. Ie. semi/nppl/psp and it will set factory settings for what one you choose.
Optical trigger is basicallly an analog input so for debounce its always going to be better than a digital microswitch.
Set up the trigger the way you like it, choose optical trigger in teh hardware part of the menu then fire it with paint and if its bouncey. Simply adjust the debounce up one level.
You dont have to use the TT filter, jsut use the present debounce settings.
thats why they are there for.