For me when going up in tower i rarely get a chance time. While on Ex sometime i get them one after another lol, or at least few time in 10 - 20 spins. I'm like why would i even use radars if so many.
Also i'm kind of spamming all shakes from boxes or some of my stored namins, so getting the 100 - 300 from EX prize few times per day.
Setting a goal on how much u wanna do in that day helps too. Like first day i slacked ( did open some cases though) and only had 1,5 k trophies. Next day i did 8 or 9 k to be back on track.