I'm curious if you ever tried to parallel trade live and Sim. I think the lower your trading timeframe, the less reliable your sim will be. For heavy scalping, most likely it will actually be misleading or as l like to call it - stimulator.Practicing and honing my scalping skills on sim first.
Rookie mistake you say, but there are countless gotchyas when you trade low timeframes. Bottom line - when you scalp, latency (both mkt data and execution) matters. What you see on the screen is a oftentimes a mirage.