I know your pain Joe_Bowers. I tried totaling up up all the inputs eligible for staking in CWallet::CreateCoinStake (in wallet.cpp) then printing the result out the log each time it's called. But the total just jumps around randomly. I can't figure out if there is a bug in that function, or I just don't understand how that function goes about finding inputs that should be checked for possible POS block generation. There is supposed to be some unpredictability function so people can't game their POS blocks for some kind of timed attack. Perhaps that's whats making it tricky to understand.