I know some stuff about panning. The trick is that all tracks should have their own unique panning position. I like to keep my bass instruments(such as kick and bass, obiously
) somewhat in the middle.
1. Kick Drum - Around the middle, maybe a very small bit right.
2. Hi Hats, snares ect. - Try to keep a balance in panning on drums so you get an equal level in both sides.
7. Sub Bass - Around the middle, possible a bit to the left.
8. Bass Arp - Also try to keep this somewhat in the middle.
9. Strings - Dont do anything drastic with the strings. A slight turn to on e of the sides, but not too much.
10. Piano - I like panning effects(such as right->left->left->right ect.) on the instruments that are in less presence.
11. Synth Melody, FX, Vocals - Use these where you want, just remember to keep a equal, but dynamic level in both sides.
Hope i helped