In addition to the 2900 you may want to try a cut around 1350Hz. With a parametric eq you can move these frequencies around slightly to get just the sound you want :-). Also rolling off some highs can give a greater sense of distance and blend.
For the GOS celli and contrabassi, you could try a compressor (soft knee) to give extra presence/warmth/focus (these sections can tend to sound a little "flabby") and/or similar eq to above. Good luck exploring the possibilities, these are just some starting points and in the end it is rather subjective.