You dont need a drop dude. Try altering your posture to suite your marker and you profile. What I mean by this is if youre standing perfectly upright with your bottle into your shoulder you are gonna A) look like a robot B) stand out like a sore thumb because theres no way you can play tight like that and C) damage your spine.
I dont know if its right as I'm certainly no pro and in no way a back specialist but what I suggest is taking up a skiing position. Its how I've always been shown. Legs comfortably apart facing your target, Knees bent, body leaning forward to counter and gun tucked into your shoulder. I find I can bring my arms in a lot tighter this way. You certainly wont need a drop.
The image below (although not fantastic examples) clearly shows the difference:
http://i15.photobucket.com/albums/a386/jonnywildcard/jimmyscup1107_092.jpg
Image is the property of paintballphotography can be found at paintballphotography.com.