Thank you for listening and for the feedback! A part of me wanted to make the string runs you described louder during composition too, but I made a last minute decision to put it in the background instead because I felt like it took too much away from the strong rhythmic feel.
I did listen to it again on a different pair of headphones with a slightly different sound profile and I agree that it can sound a little bit quiet! Maybe I can do something in the mix in the future to make quiet parts like that stand out more!