First of all, it is always appreciated and respected when somebody "do the walk".
Now the bad part.
1. This kind of tests is best done with the utility written for such purpose.
You can find it here.
http://lesnihu.wz.cz/autopilot/autopilot.html
It is easy to set it up and it will execute script which will control the plane instead of you. It is much easier to test planes that way and what is even more important this is way more precise and repeatable test method.
2. Flying the plane is just half of the job, second part is logging the flight parameters. You can do it your way but there is a better and easier way. Use UDPGraph, you can get various parameters on the screen and in the file.
Download it here:
http://avcpage.achilikin.com/il2dl/graph_en.htm
Once you get these two utilities working you will be able to watch TV while your PC is doing the work for you and as a bonus you will get much better results.