I thought I replied to this.. But I may try to richen it up to 14 like yours is. I currently run 14.8 which might be why it surges below 1800. I doubt it though, the cam is relatively large.
What is your total timing at cruise. I was having to richen mine up to mid 13 until I hooked up a vac source to the distr. at have it running 45* at steady cruise around 2500. Now I can run mid 14 but that is about it.