@Egg90
Hey just saw this post today!
I am not sure if you got it figured out but I was having the same problem and what I ended up doing was not using brackets or quotes for the memory card file location. I also had to make sure that -loadbin was the last command before "%ROM_RAW%" or I got an error saying it couldn't load a .exe.
It should look like this:
<command>C:/Users/Emulator/.emulationstation/systems/Playstation/ePSXe.exe -nogui -slowboot -analog -loadmemc0 C:/Users/Emulator/.emulationstation/systems/Playstation/memcards/epsxe000.mcr -loadbin "%ROM_RAW%"</command>
I hope that helps