Bonding
Bonding is checked using a milliOhm meter. The results between each component under test (flying control, gear door, radio unit etc) should be less than 0.05ohm back to main airframe ground (battery earth). When you say the static wicks are good - have you tested them ? Again, the base should be in bond as above. Between the base and the tip should be a resistive value specified in the AMM - it can typically be 2-4Mohm.