It was discussed before 7out, and personally I feel sstheo is probably better of sticking to his plan: growing his account on a slow and steady pace. I would not call 2% slow by the way.
Though my account is a bit bigger I also switched to MES a couple of weeks ago. With this volatility a couple of normal stops with ES is all it takes to be 1k in the red and that would hurt his account for sure. He would probably be affected emotionally, I know I am. Even when a strategy is very clear there are a lot of decisions to be made to manage the trade, and being completely relax helps to think clear.
Your advice is great but being so experienced you probably forgot how trading with scared money feels. I don't mean this in a negative way, take it as a compliment: you are a more mature trader.
I look at it this way: if he keeps up what he is doing he will be trading regular ES soon enough with peace of mind, so why rush and make it more difficult emotionally?
I disagree completely and hopefully I can explain it to you.
No one is suggesting he goes for broke, but he can risk 10% of account (approx $500) and trade 1 ES the way he trades MES. he's pretty MUCH scalping for pennies ($10 or less average per trade), he can easily take a shot and try the exact same thing but using 1 ES. If he loses 5 trades, then fine - he took a shot and failed, no big deal.
However, he currently has an edge. HE MUST LEARN TO MAXIMIZE IT WHILE HE STILL HAS IT, because there is no guarantee of tomorrow. If he succeeds on the first 3 trades, that'll give him great leverage to continue - and if he all of a sudden fails to continue this path with ES (assuming all else is the same) then he has a mental impairment for trading and it will hinder him going forward and he'll just be wasting his time.
Think of it like in poker, you have AA preflop. There is plenty of action before the action gets to him. He must shove all his chips in the middle to lock up all the loose money out there already and if anyone calls him (yes he has a chance of losing, but he'll now be a heavy favorite to win more). He must go for it.
In a gambling situation, you're in a casino and you see a table cheering and going crazy. Let's say craps - the shooter is rolling and table is going crazy, you jump on for the remainder of that roll and press the crap out of it. You can only lose (lets say $100, but if the roll continues for a short while you can collect that $100 and make much more freerolling the casino, since the plan is to leave after the roll is over regardless if up or down. Same thing can happen on a baccarat table, you walk up and everyone is going crazy. You see the last 7 hands were won by banker, you run with the banker until the streak ends. Please don't take my gambling scenario too literal, but he currently has an edge. He must learn to maximize it, not wait for it to end and then try to recreate it.