What software are you using on the computer - most decent software will give you eq and effects nowadays, so using the mixer for this seems a bit pointless. I have some rather nice mixers in use with my systems, but they sit with their faders in a row and eq switched out - just allowing me to get a pile of external sound sources into my interface - once it's in the machine, I do everything there - far simpler and sonically better.
Going from device to device is very common in stage sound - cascading mixers isn;t really an issue with most kit now - in your case, it obviously works and you are happy - so that is fine. You can just do more inside a computer nowadays - with eq, fx and mix automation.