Hi Houghy,
Your M45 shot looks very nice.
I don't see excessive red there at all, as there is a bit of background red in the nebula of M45.
The usual heavy red from a modded camera requires the custom white balance I mentioned in the earlier email or using colour processing and pulling back the red a lot.
In your M45 image the black though is a bit too black - so some data has been "clipped" and this also includes some of the fainter nebula. I used to do this all the time.
A good read on Photoshop is Wodaski's Zone System. Goes over everything.
You can send me the jpegs and I can have a go.
bradgregley10@yahoo.com
Cheers mate,
Greg.