Nice track. I agree with the critiques suggested by the others. There's a lot of reverb and low end mud going on in the percussion and it could certainly benefit from more clarity and balance. It seems like you were going for really powerful drums to drive the emotion, but the end result is too muddy and sloppy. I would suggest toning down the reverb and using eq to cut some of the muddy and boomy frequencies. Maybe you could experiment with other ways to add that power such as layering more similar drum samples to increase their frequency range. This is one of my goto tricks every time I have something that lacks the power I need. Often times it's just actually just the samples lacking specific frequencies that you need. In my most recent track I used two different sets of timpani samples plus a sample set of sub bass boom. I blended them all three together with separate eqs and light reverb then had them playing together as a single instrument. You would never know I'm using three sample sets from just listening to the track. I might also suggest experimenting with a very light bit of sidechain "pump" compression applied to the strings. This could create the illusion of power without actually having to turn the drums up or the strings down. It might work, or it might sound corny and unconvincing. It could be worth a shot though.
Keep in mind all of this is only mentioned for improvement / educational purposes though. I still thought it was a solid track! The composition is quiet nice. 
[Edit] I missed the post where you said you didn't add the reverb. I'm assuming they just came with the sample then. I would find some good timpani samples to layer on top of it, then turn the original sample down and cut anything that's too boomy. If it doesn't work I would discard it completely and find something different. A sample with that much reverb saturation may be better suited as a climactic buildup sorta thing rather than a percussive element that runs through the whole song.