Spark Plugs

[BBKNARF]

Why doe's my car slightly hesitates @ low rpm  It was running fine until I changed the plugs I was running NGK V-Power FR4 stock #5188, some guy told me I should run the NGK BCP7ES stock #5030
the performane will be better, but it's not. I'm running a stroker 451, 10.6.1 comp., Edelbrock performer rpm heads and intake (dual plane), Holley 950 cfm D.P., Comp cams roller mechanical, I evin bumped up the jet size from 79 to 82 primary, and 82 to 85 secondary, after checking the plugs after 40 miles they are a very light tan in color,  my total timing advance is @ 36 and it still did'nt help why ? I think I should put back the old plugs in.