it's an interesting piece, that bodes well with the masquerade imagery, I'd agree with one of the reviewers who commented on it being reminiscent of Danny-Elfman's works; the piece has a playful, slightly mystical quality to it. I like the space you leave between the motives, and your usage of phrygian cadences (at :16 and the end of the piece). The contrast is nice between the lively string introduction and softer second half of the piece with the flutes and harps. My foremost suggestion would be to bolster up the instrumentation, the first half of the piece could use a contrabass to round out the opening string lines, some high-mid register orchestral percussion such as castanets and/or tambourines could accentuate the groove. Then you could mirror the part in A.) after the soft interlude by complimenting the strings with some brass and or woodwind instruments, IMO bassoon and clarinet sections would fit well with the theme of the piece. The intro could use more varied dynamics, but now I'm just nitpicking...
yeah, the strings are probably too loud in the second half of the piece, but I think it's partially due to the violins patch you are using, it's too aggressive. Maybe the lower velocities have a more delicate layer? If it's available in your library, try experimenting with another marcato or staccato patch. using a viola section (or even solo violin- since the second part is less thick in texture) may be slightly less abrasive. I'm not familiar with symphobia or what the deal with combinators is- but you should be able to manually turn down the volume for each patch within the kontakt plugin. if the combinator is the problem you could always open up a separate channel (or clone the same one) and send it through an individual mixer channel, and adjust the volume externally from there. although seeing as how you used Reason prior to FL Studio, if I'm remembering correctly- you're probably a master already and know all this lol. If you don't use midi controllers as your primary method for sequencing the notes and patterns like me, you're going to have a blast with FL lol