In chapter 11 as you enter Mahhabara there are Cyhedron and Hoplites that drop Solenoids and Bomb Cores. You have to keep farming them and gain massive CP (5110) and the drops are about 500 points towards weapon upgrades. So if you use your orgainics to get a a 3x multiplier the use about 10-15 Bomb Cores or Solenoids with the multipliers you will jump up 4-10 levels each time you upgrade your weapons. However, if you do this then go all the way with the inorganics and do not be sparse because you will blow the multiplier. Use Thunder for the metals and fire for the Cryhedron. You should be a beast in about 2 hours.