The spikes are normal and no it's not due to missing to lean, it's in the ignition system that runs the rpms. There is an adapter you can buy if you don't want those to show up in the graph, IMO it's not worth it. Most can see the pattern in the graph. The part of the log you want to focus on is the full run at wide open throttle from launch to just past 4th gear. You'll need at least 1/2 mile to make this run. All the info you need is on that run. The before and after don't mean anything.