It was mainly to make it stand out from the other tracks. That's why when I compose metal tracks I always have one track set to Overdrive and another to Distortion, since from what I know from GP5/General Midi emulation when you have two tracks that are exactly the same, even when if you pan them hard left/right when played back they will sound like there is only one panned to the center. I also prefer the timbre from the MIDI jazz guitar since the electric guitar clean one sounds too tiny to my ears.
Glad you liked the changes I did to the drums, from what I understood you didn't want anything too elaborate so I tried to add some swing to it by adding the snare hits on the and's instead of being just a snare on the second and fourth beat.
Are you planning on having vocals?