How can i improve my 4x4 time?

Use most of that inspection time to locate majority of the center pieces and you should easily be able to plan the first 3 centers so you can follow an adjacent color of the 3rd center to continue without pausing.
 
You should be able to do 2 centers during inspection (3 would be hard!)

I must be quite special then :P that is a little too much especially when he isn't used to using the full inspection time. I should have also mentioned that it's normally an estimate of the 3rd center that gives extra time to look-ahead.
 
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