Noise reduction (process) on HD video's audio with shotgun microphone (hissing)

okay so i normally master live sets on the condenser microphone in my teams studio but it is not available to the public so i've started doing freestyles, when i use the noise reduction (process) on the audio of my HD videos to remove background noise which my camera is intaking for some reason unknown (on both shotgun and camera) this is without any corrections on, everything on manual etc so nothing to cause the distorted hissing sound.
I stand with the speakers behind my as my shotgun doesn't pick up much from behind so the beat is very quiet, i then have the mc's in front of me performing and i later on add on a 320kps version of the beat in audition and add that audio onto the video.
I started with the FFT size: 4096
And then switched over to try again on FFT size 512 which both fully removed the beat and hissing from the whole audio (what i was aiming for) but both still messed with my video's audio by making their voices sound weird and echoy.
The hissing problem i'm encountering is common although it randomly started a week or so ago, my camera is the Canon 600D
i've looked up on how to resolve the issue but none of the fixes have worked for me
Putting everything on manual didn't work
Turning auto corrections off didn't work
Turning the volume down a lot did work but did not pick up sound levels or quality anywhere near the level i need
I phoned up canon customer services and they told me to send me camera off to the other side of the UK since i have warranty but i need this camera daily and can't afford to go however long they plan to take to return my camera in working order.
If anyone has any advice for me it would be much appreciated, thank you.
www.youtube.com/ohnoloweit for UK Grime music

When you get to Process > Noise Reduction > Reduce Noise, usually a preset isn't the answer, but some manual fiddling. 
Here's the way I approach this:
1. When I set the noise print, I play/loop the clip and note the level of the noise in your meters. When I get to the threshold in the noise reduction window, that level will be the extreme highest threshold I use, only going lower from there.
2. When it comes to the reduction, I check the Noise only box while I'm setting it, and boost the reduction until I'm getting noise, but not too much signal I want to preserve. If I hear voice in there, I'm doing too much. And I rarely end up going beyond 60%.
3. Uncheck the noise only box, and listen to the signal with noise reduced to fine tune further.
Remember this is noise reduction, not noise elimination. And, the STP tool is pretty good for what it is, but it's not anywhere near the best out there.
Good luck, and I hope this helps!
Matt

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