Sportsbras are good if your chest is on the smaller size to begin with. Sportbras in my size are hard to find. But I did that too before I took the step over to binding. The chest got a tiny bit smaller. But wearing a bra when not binding is a must for me, or my chest and back will hurt. I'm a size 85 G in Swedish measures. Dysphoria deluxe with the bra and without.
I'm happy you found a way to lower your dysphoria. Keep finding and fighting your way through the dysphoria jungle.
Tony