I alright i took the liberty to play on other servers nearby (Atlanta, GA) and on those servers I only had a ping of 40ms, they were of similar size, though some of the them ran different plugins, but I had no bullet reg what so ever, I was even close to get banned because I owned the other team so hard.
Now what i noticed is those servers are 100 tick, although anything above 26 players was 66 tick (which is understandable) but the 100 tick servers in same size of WCU ran settings of Rates max 30000, Cl_updaterate 101, Cl_cmdrate 100, cl_interp 0.010, cl_interpration 1
Now rates no problem because I can run 30000 on WCU, but for for the interps, which I frankly believe is what causing some of us to have bad bulletregistration, is cl_interp 0.020 (0.011 – 0.030) cl_interpratio 2, with a ratio of 2, that means the cl_interp is really 0.022 – 0.060, and before I used to use 0.010 in interp (not sure about ratio) but that eliminated completely choke and bad bulletregistration (this was before summer and 66tick)
Im obsessed 
btw I happen to play with skins and effects (muzzle flash, flashlight, Nightvision, and blood) however it seems that those doesnt work on wcu server? i thought it was a sv_pure 0? or maybe im just retarded and its running 1? (2 is completely off?)
**edit**
alright you running sv_pure 1, any way you can allow materials/effect?