iPhone4 statistics

I understand that the amount of Draw Calls for the iphone4 would be best to be lower than 30, but what about the rest of the statistics?

I have these statistics for my game at the moment and i am running at around 18-20 FPS;

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Draw Calls = 14 (Batched = 4)

Tris = 44 (Verts = 92)

Used Textures = 14 - 12.6mb

Render Textures = 0-0b (Switches = 0)

Screen = 640x960 - 7.0mb

VRAM usage = 7.0mb to 19.7mb(of 1.00gb)

VBO Total = 51 - 102.5kb

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I am currently using Sprite manager 2 to help generate my sprites and i am using the packed sprites java script to do so. Each image is set to Texture and True Color.

Any thoughts on how i can increase performance? I have told the artist so far to group some images together to again reduce the amount of draw calls but i have read that the VRAM is what to watch out for to be able to boost performance. How would i go about to do so?