Rob,
I listened to the intro a few times.I don't mind the guitar starting the song over one the side at all, when the 2nd one comes in it doesn't seem to quite match it for tone but that's OK because the bass & drums come in pretty quickly to fill the space.
I reckon you could duplicate the strings and put a set on the other side with a slight change to time, (a delay of a milisecond or three would be enough), or tone to get a BIG O effect. As they are the higher violin sounds closer to a pedal steel. I guess that's the difference between a string quartet and a clutch of violins. Alternately you could use an Automatic Double Tracking plug like
https://www.kvraudio.com/product/adt_by_vacuumsound to do it for you. It takes a little fiddling to get the thing right but it's easier than actually double tracking.
The solo is excellent but ends a bar short. You could copy & paste the last note and extend it so it plays out or generate a tag part and import that to fill the empty bar.