good construction but STILL not supportive enough

This is a nice sports bra that comes in a lot of different colors. The coolest feature is probably the adjustable straps. Yes, you can use them for a custom fit - but you can also use them if you're a nursing mom!In terms of support, it seems as if I am the only disappointed customer. I really thought this would provide more support than my other sports bras, but I still have to double up with another sports bra. It is somewhat more supportive, but not enough to wear it alone. I tried tightening the straps but it didn't really change it - I'm still bouncing uncomfortably. Perhaps there is no such thing as a supportive bra in my size - I am currently a 36DDD.It would be fine for walking, maybe light jogging - but it is not good for jumproping and jumping jacks. I will keep this bra and wear it for lower-impact workouts, but I will have to double-up for anything that involves jumping.