Another big reggae fan... Reggae is about all that I play and record actually...
Here's what I'd do for this mix:
- I'd remove the effects you have on the back-vocals, and I'd pan them all around to give a really englobing effect. (I'd track extra back-vocal tracks if necessary, until you have enough to create a very "airy" wall of back vocals). BTW this would be the way i'd go with this, but it's also good the way you did it, just different. The lead vocal sounds great btw.. he sounds like a mix of Toots and Ken Boothe.
- I'd completely retrack the organ part. It's the weakest link in the song, if you ask me. It sounds like a D.I. track from a toy organ, or an unprocessed B4 track.... If retracking wasn't an option, I'd at least try to pass it through a nice guitar amp, or try to get it some personnality through effects like Scarbee Vintage Keyboard FX...
- The clavinet also sounds a bit fake, but it's satisfactory.. I'd pan it somewhere to the side
- I'd add wah-wah on the guitar track so that it's completely opened on every "cha-ka, cha-ka". And you know what, i'd leave the "cha-ka" for the organ, and I'd retrack a guitar track that only does "Chak - chak - chak" instead of "chaka chaka chaka".. The way it is right now makes it a bit busy and draws attention from the song itself. (the guitar track is also loud a bit)
- The drums sounds good, but I'd add reverb on the side-stick and I'd try to do something to the Toms to make them more present and more "cartboardish" like the toms in old-reggae.
That's about all I can think of. It's pretty good overall, the feel is there. The singer has a great vibe.