Darran/Zedcars,
a last observation which can be difficult to alter here, since you are already quite advanced in this project, but might be of good help for your general writing:
In your example there are many 4ths in the upper voices of the strings, and sometimes even in the violas. Please be aware that fourths in neighboring voices (or even in one voice as divisi) always need special intonation consideration and are prone to sound out of tune if not being executed very well (which needs rehearsal).
Now, these fourths might be a very conscious choice if you are going for the "fanfare" sound. But if they repeat very often, then it could also be that this came from a typical pattern of transferring piano chords to a strings arrangement. It is quite tempting to put two hands on the piano for a chord, play typical piano patterns, and then to allot the left hand to CB + VC, and the right hand to Vl + Va. But these dreaded fourths are one typical symptom of this, often representing the pinky and the forefinger of the right piano hand, or the thumb and the middle finger in other inversions.
Another symptom of this is that as a result we will often find the viola playing quite high passages. All this will make the upper frequencies quite populated, with a hole in the middle, and only then comes the bass. This can be good if you for example want to make room in the middle for other voices (e.g. winds) but only if this is a conscius decision.
You will hardly find many of such fourths in the works of classical composers, and they knew why. The easiest way to make such passages less critical, is to transfer one of the both notes one octave lower. This is referred to 'wide voicing', opposed to 'narrow' voicing. (EDIT I see that in anglo-american this is also referred to 'open voicing' and 'closed voicing'.
You find two examples in the attachment. In the first bar we have a fourth between 1st and 2nd violins, which is intonation critical to begin with, also a special sound at itself. Below that we have a third between the 2nd violins and the violas ... such narrow intervals are very nice between two upper voices but tend to produce a 'wall of sound' between middle voices. Why? Because narrow intervals always produce many harmonics, and the lower in the mix this happens, the more it populates the sound ... and not always in a pleasant way. Again, if that is your purpose then go for it, but consciously.
In bar 2 everything is relaxed. We have a sixth between the two violins - sounds very nice and is easy to hit, and a fifth between violin 2 and violas. The violas fulfil their natural role here by bridging to the bass.
In bar 3 we have another example of narrow voicing. The third between the violins is nice, they will produce that lovely 'duet' sound. However the fourth between v2 and va is somewhat nasty, and we have an even wider gap to the bass than before.
In bar 4 the situation is relaxed again, a sixth between the violins and a fifth between v2 and va.
Now you say 'but I liked that lovely duet sound between the violins!'. Fine, then go vor the solution in bar 5, creating some distance between the violas and the violin pair. However the violas are still far enough away from the cellos (a fifth) not to produce too much acoustical mud (less than e.g. a third in that range could easily do, if being in the middle of a mix).
If you overdo that and put the viola even further down as in bar six, then a narrow interval (third in this case) to the cello occurs which can will make things muddy. Of course, if only the violas and the bass instruments would play, without the violins, this would not be much of an issue, and could actually sound very nice. However with the violins above it, the harmonics of that low third can clash with the violins and create a 'wall of sound'.
BTW if you look at the viola voice you can 'see' that for the wide voicing it inhabits its natural
living space without being forced into a different role.
Probably you already know all that and I am preaching to the choir, in that case please forgive me. The situation was just too good to explain a fundamental phenomenon that I often see in arrangements.
Now some readers here could comment: "Yes, but I am not classically trained!"
To which I respond: "Maybe, but I explained this here in a way that everybody can understand it, no matter which formal training (as long as one can decipher the music example). Actually the so called 'classical composer training' has very much to do with the observation of such very simple circumstances. So, whoever reads this, no matter your education, why not pick up this snippet of information and make use of it!"
Hope that helps, Hannes