Issues with money management

I made an EA and have been playing around with it some time and all of a sudden I've added a money management section and it is no longer profitable. Get this... at the bottom I've attached screenshots of the balance results for the backtesting of the two systems. The one that ain't so crash hot has code that calculates the optimal lot size based on the simple principle of... all stop losses being worth 5%. The other system just has a hard coded lot size value of 0.1 for all trades. I'm confused why am I getting such vastly different results? What don't I understand?

EDIT: I've realised there is no scale but essentially, the initial account balance is $1,000, the max for system 1 is ~$4758 and for system 2 ~$1326. Thats a massive difference, MM or not!