Programmers, I need clarification and ideas on spread

I am currently working on a ea that is a scalping strategy . It is performing decently well on EUR/USD and I am realizing it is because the spread is relatively low ( or the lowest at any given time ). The strategy will work super well on any other instrument as long as I set the spread really low, but the average spread it than performs horrible.
So , I tried adding the spread to the stops, but no good. What could I be missing? Or am I at a impasse?

Thanks in advance

I tried adding the spread to the stops..

Increase it a bit more than just spread give it few pips more, if your strategy works well it will continue to do so.

Thank you.

I did add the spread to the stops, and just now tried adding a bit more just in case. I have messed around with it quite a bit to see if I could figure out why the spread is affecting it so much.
So far, it will only work in one instrument, the EUR/USD , while the others will only work if the spread is a below average, which is actually the norm for the EUR/USD.

Maybe this strategy is only valid in one instrument? that can't be right, right?

Yes its possible.

Thank you :)

You might want to look at USDJPY. The average spread from IC Markets on my live ECN account is 0.5 pips, but they take 0.07$ / micro lot. I still prefer paying commission since it gives me the option to include / exclude it from my profit targets.