Alright, then what your probably seeing is what Heide264 (or w.e it is), posted about in the fuel line mod thread.
Basically, some tuners / car combos required basically a dip/hump in the timing in that area to compensate for the stock fueling setup / ignition timing.
You may need to talk to your tuner about smoothing that area out and removing any large bumps in it.
Basically, the dip is there on cars because of trying to find MBT in that general area (lower load, partial throttle, transition to light boost), fine tuning ignition down there can cause pretty random but reproducible knocks in that area, and alot of tuners compensate with this by bumping the base timing tables up, to counteract, what the actual load compensation tables do. (basically the load compensation tables inflate the LOAD up, which when timing is graphed is shown as a dip down in timing) [WARNING: this may be confusing to some, so consult with your tuner / send them this way to see what I am talking about, it is referenced in the fuel line thread as well, or pm me! Either way dont just increase timing in your lower load / cruise area thinking it will help with knock! You must first make sure the hump exist by consulting your tuner and or looking at your timing tables graphed out in 2d & 3d graphs and have the fuel line mod INSTALLED!]
If you smooth this bump in timing because you have reduced the load compensation tables(effectively reducing how much load is inflated, and thus not reducing timing as much), it should get you what you are looking for.