1) FXCM is sub-retail. I'm afraid you've lost your time so far. Your best bet is to open an account with IB as it's probably the only
discount broker that is considered serious by smaller institutions. Same goes for myfxbook as
@Adibi83 mentioned
2) You'll need a better presentation than this, I see 5-10 hedge fund presentations a week and they all look the same, you need to look the
same if you want to be treated seriously.
3) Nobody likes FX when it comes to serious investors, your best bet would be to try to adapt it to the futures market or cash equities. The mindset behind this is that we don't see any big FX fund that actually work but see many equities and futures fund that work well, so nobody will risk their clients money on a FX manager (remember nobody invests their money, you always talk to someone who manages the money for someone).
4) Don't ever say "reliable back-testing" with MT4 screenshots. Try to build your own back-testing engine in C#, that is really the base of quant trading and will allow you to improve your approach much faster