Indicas are definatly you cola dominant strains as they then to be shorter than their Sativa counterpart. However this does not mean this happens 100% of the time, it all depends on genetics really. The only true way of knowing is trial and error by yourself and finding strains that fit your needs.
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As far as your girls go it looks to me like a bit of nitrogen deficiency, easy fix just add some nutes with a higher N content than what you are currently using. For example if you are using strictly blooming nutrients now mix in a bit of the nutrients you used during veg(assuming you vegged anyway)along with the blooming nutes with your next watering. Also be sure to keep a close eye on the PH of your water as coco tends to hold salt build up left behind from nutrient formulas. Hope this helps