I wish I could help. I have cut out caffeine pretty much completely and have not noticed any decrease in PVC's at all. I must admit I do sleep better at night but the PVC's are still just as bad. I haven't noticed any difference in moderate alcohol in myself as well. Since I don't do recreational drugs at this point I couldn't say there.
Trigger is probably a better word for what you're describing. Alcohol, tobacco, and drugs are all well-known triggers to people who experience PVC's. It seems to be unclear whether or not your past history can attribute to your current state of arrhythmia. PVC's are very frustrating in that there is no known true fix, although many people will swear by their own methods. Your case sounds like min, the PVC's come and go at will, although in my case I believe alcohol will cause them the following day, with wine being the worst. Hope this helps.