Advice on stereo panning of the orchestra

Hi to all.

I've recently revisited this work to create a more accurate mock-up, and just wondered if I could get some tips on my stereo panning and mixing/mastering.

It's all be created in MuseScore, with some of the extended instrument libraries from Spitfire, Berlin and Cinesamples. 

The score is designed for MIDI mock-up only.

I tried to pan the instruments to roughly where they would be in a real orchestra, though I'm not sure I like having the high strings ranged left and the low strings right.