Perhaps change the price of the combination coupon in-game to around 2m per coupon making it about 18m per part to make, and 52m per set. Which would be a nice average price. Rather than the 6.5m each it is now (175m per set which nobody would value it at), with the giga drainage a while back, and nerf of 172 parts it's hard to obtain that much for a set nobody would really waste money on to make because of the FREE raid op armour. Just might bring in some more interest to buying and making +7 sets again into game if lowered.
Also why have a double xp multiplier in zc shop, if you hit way over the cap already? o-o. Unless it was to be changed so it would allow to go past the cap but only gained xp advantage no gps/coins advantage?