Strategy tester current spread .4 vs fixed spread 1pip on 99% data

[Kevin Cherry]

I have a question about the spread on strategy tester. I have installed birts ea data from dukascopy 99%. It seems when I am testing my ea at current spread I get a bad test, Keep in mind,( my ecn broker gbpusd is around .4 pips consistently and never really exceeds 1 pip. However if I set my spread on strategy tester to 1 pip my ea seems more stable. How is this possible? I am looking at the spread right now of .4 pips and it has not gone more than .7 for the duration of the test at current spread. If I set the spread fixed to 1 which is very liberal considering current spread is .4 pips, the test comes out great. How is this possible? 1 pip should be more than enough to cover the fluctuation of the test. What is going on here? 1 pip fixed is a great result, but .4 current is a bad result?? I am confused now, can someone clear this up??