As I understand it you will get the most stable var if you are always trading the same lots per trade. Meaning it does not really matter if you are risking 1%, 2% or 10%. However, I think one weakness is that Darwinex is not considering the actual stoploss as they don't know beforehand when you will be closing the trade. This is why Darwinex starts partially closing your trade if it's open for too long and is in too high of a drawdown.
My system adapts its stoplosses to current market volatility so while my risk per trade remains stable (2.5%) the lotsizes will vary. I guess this is the reason why my darwinex var is also fluctuating a little. I am open for discussions if this is good. With a smaller stoploss the likelyhood of a full stoploss is higher. However the market volatility is lower (which is the reason why the stoploss is lower in the 1st place) ...
Just increasing your account equity won't change your var, granted you are trading with x% of equity (no fixed lots). However trading with a very low var will make your Darwin an unpredictable beast in my eyes. In theory it shouldn't matter if you are trading with 0.1% var or with 99% var, however in practice this can totally destroy your darwin.
Adjusting the var during trading seems to have made the darwin miss the recovery whereas the actual strategy is on new highs.
@integracore2 on regards to your strategy PLF, I would say that your var is developing in a problematic direction, given that your var still keeps going down. You should try to stabilize your var at a certain level. Please don't take it as offense
In december the darwin replicated your strategy by a factor of ~4. Given the numbers from your backtest that would mean your darwin could lose ~12% in a single day. That's still ok. When I am looking at the history of my darwin I had a worst day of ~18%
What I personally prefer though is if the trader is keeping the strategy's var around the same ballpark as its darwin. That way the strategy and the darwin will usually go into the same direction without too much deviation. If you decide to increase the var of PLF you should first stabilize it at the current level and afterwards increase the var very slowly. I agree with @CavaliereVerde in regards to var stability. But in order to avoid drastic effects on the darwin I would try to increase/decrease the strategy's var very slowly.
Again this is just my personal opinion.