I now need further help

After approx 18 - 25 miles when I go to roll on to overtake, the engine is starved and does not want to go, doesn`t happen everytime, but often enough to be a pain in the arse, there are no other issues, this is it.
My next plan is to ensure the coil connections are all good and then test it again, so anyone have any ideas what may be causing this or more to the point experience.
I have to say that this bike goes like a stabbed rat and it is an absolute pleasure to ride...If I keep the throttle nailed when it kinda cuts out, the power comes back in and wants to lift the front wheel at ridiculous speeds
