Hi Jonathan,
It's funny, I'm currently working on a song that uses the exact same chords in the exact same chord progression as yours. I actually came accross the chords while watching a YouTube video of an acoustic arrangement of "I Can Only Imagine".
I took the liberty of downloading your mp3 file and played with it for about 15 minutes. I imported the file into Sonar and then cloned the track. I used a split stereo setup using Vintage Channel VC64 on each one of the tracks, which allows you to EQ and compress both left and right channels separately. This gives a more spacious sound in the stereo field.
I EQed the left and right channels of both tracks to separate the the lows and highs, cutting frequencies in the left while boosting the same frequencies in the right.
I also cut frequencies at around 100 and 800 in both tracks to get rid of some of the mud. I also boosted some high frequencies (8,000 and about 15,000) to make the cymbals and snare hits stand out more and to brighten the mix while also cutting some low mids.
I think one thing that may be making this difficult is the strings you're strumming on the clean guitar. If I were you I wouldn't strum the low E string while playing those chords. Instead use a bass guitar to fill in those low frequencies. I think it would make the mix sound much more crisp.
I took the liberty of posting your song on my page so you can download it but I'll delete it once you've done that.
You probably won't hear much of a difference unless you import the mp3 I worked on and import it into Sonar allowing you to make a side by side comparrison.
Of course I'm limited to what I can do because I was only working with the final mixed file and I didn't spend too much time. You could probably do a much better job by working with each track independantly. I was just playing with it a bit.
This is going to be an awesome song and I can't wait to hear it after you've added the vocals. Of course you already know it's best to work with the mix after the vocals are added because it changes everything. I would add the vocals first before you try to perfect this mix.
Great job on this!
Oh, here's the link for the song titled "Johathan's Rock Ballad". I haven't posted a song in so many years that I forgot how to do it. Took me longer to post it than it did to work on it. LOL
(Deleted Link)
Oh yea, I also used a volume envelope and increased the clean guitar "pling" thing near the start of the song by about 6db. (That part where it goes abrubtly silent except of the quick strum on the high strings of the guitar.)
Pete