Going back 3 years with this strategy there has never been more than three contracts open at one time in a trade (less than 1%). Most trades in the last 2 years have been with two contracts, or less, open at one time (about 99%). A large percentage of the trades have been with only one contract (about 88%).
Here is one way you could look at scaling up but limit the number of contracts to reduce the amount of strategy capital utilized as well as reduce your total amount risked:
Say you want to scale up and trade the strategy at 200%. Just set the scale in the C2 auto trade control panel at 200% and set the max number of contracts at 4. Most times you would have two contracts open and sometimes a max of four contracts open. This method would have taken all trades from the last 2 years but would have eliminated the risk of taking on an unusual number of contracts in case there was an outlier trade with a large number of contracts. This would require roughly half of the C2 stated strategy capital (assuming some overnight holdings) thus approximately doubling the stated return but also doubling the drawdown.
Since most trades are one contract only you could scale at 300%, set the max number contracts at 3 and still could have participated in about 88% of the trades at 300% scaling with a three contract limit. This would require less than half of the C2 stated strategy capital but could approximately factor the stated return by 2.5x to 3x with about the same drawdown as per above.
One could theoretically scale at 600% with a six contract limit, capture about 88% of trades, and should easily be within the stated C2 strategy equity.
Furthermore, as stated above, be aware that scaling this way will multiply the stated percentage return but it will also magnify the stated drawdown percentage.