34000% profit in a forward test! Need help with FIX API

Hey guys, first up, this is not an advertisement, nor am I selling my system. Also, I am not a programmer, only a trader. I have quite the experience in forex, and together with a programmer, I have designed a high-frequency scalping EA. As you can see, the results on the demo account are pretty impressive. However, quite predictively, the results aren't the same on the live account, mainly because of the slippage and the latency.

Hence, I am willing to use a FIX API to solve this problem since I am convinced that MT4/5 will not work because of the brokers' plugins to limit such strategies, plus I intend to trade large volumes, thereby attracting even more slippage. I do not intend to make 34000% gains every month, it is only for the sake of the test. If you look closely, you may notice that the EA didn't perform optimally because we were trying to tweak the logic to make the trade duration longer (it didn't work).

I have some contacts at PrimeXM who are willing to help me with this, but I am an absolute newbie with the entire idea of FIX API. I am still learning about this, and from what I understand, I believe that I have enough funds to try this option out since it seems worth it. I would appreciate it if someone here can shed more light on that subject, like using the right brokers for FIX API or your experiences or any suggestions. Unfortunately, the programmer I worked with has no experience with this, so if you are willing to help, please reach out to me, and I would be pleased to work with you.

Thank you!