I know this might sound silly, but it is not meant to be silly. It is difficult to get use to hearing the hammer fall, before the gun goes off. I use the hammer falling as an indicator that the rifle is about to go off. Flintlocks take alot more follow through than any other type of shooting. You basically have to focus after you pull the trigger. I have taught myself to refocus my aim after I pull the trigger. It takes a conscious effort. Try it.
By the way-LH flinters are the berries. Tom.