Like a cloud D/DD sizing help!

I'm 5'1 and I wear a 32E/30F bra. I tried the LAC B/C in store once and fits a size 6 though I wish to underband can be tighter, meanwhile my side boobs were overflowing in size 4.

I have seen several threads where people sized down for D/DD bras. Should I size down to size 2 or 4 in like a cloud D/DD?