I would rather worry about his Divergence, even with his small investor money.
To the topic, i think VAR calculation is not perfect, but pretty good. I think it is nearly impossible t have a straight line and always same VAR of the underlying account, just one "hack" is there, if you add/remove money and start to trade with same money every day with a very high risk (Var 100%). That's the only way to get the best Rs ;D But it "kills" the underlying strategy chart.
In your example the system is penalizing that your are using a martingalish approach, it got clearer after first bigger Drawdown, and much higher leverage as usual. This way Darwinex want to protect investors from to much gambling in future. It is very unlikely you will have a very stable Rs over a long period.