Want to take up running but haven't found a bra that supports

I want to start running (I workout at the gym) i can't even do skipping or much cardio cos of bigger breasts. I am someone who has smaller underbust and large cup (30FF) making it difficult to find the right size. Even the regular bras I wear have been found after so long but they aren't sports bra.

I do have sports bra from enamor I wear at the gym but doesn't provide much support if I start skipping as the bounce hurts. I need something that just stops them from moving at all support. I tried in to jockey and decathlon store - but couldn't find the right size for me which is comfortable. Unless there's a proper support, i cannot run as it pains. If anyone has any recommendations please let me know.