On your 18x20 EXO3 Tour - 3g total lead at 2/10 to get the swingweight up to the Diablo. Add 10-12g of lead at the top of the grip under the finishing tape to add overall weight and make it slightly more head light. I use 1/2" lead for this instead of the normal 1/4". String it about 5lbs higher than you do the Diablo to bring the launch angle down.
All of my EXO3 Tours have lead. I don't need it on my Diablo Mid or POGs.
Tour 100T ESP extended to 27.375", Pro Line X 16@56, TW 1.3 leather, 5g @12 - 333g - 5 HL