So I noticed over a number of 1000swing DMG tests that my +4 bapho staff is still maintaining the 18% proc rate. When I put create magical weapon on I notice a 1% increase in proc rate.
I thought on any over enchanted weapon they gain 1% proc rate per enchant i.e +8, +9, +10 for safe 6 items and +3, +4, +5 for safe 0 items