well, since I also new with their WTI price. next NFP release should be their first test. I would look closely during news released, I've been observe with their most major pair. as Tickmill offer 0.4 pips average spread on WTI price, I assume their widening are not really much during volatile time such NFP. perhaps I would enlist oil price into my current trading system, ( so far works mostly with major pair, below 1 pips spread).
there's no such price feed without any slippage, important is did the brokers side allow positive slippage instead only the negative one. seem a solid trading system you had here. please keep us inform of any current result and any personal inquiry upon their trading condition.