Dashmeter pro has a telemetry page, it seems to be with speed/ trottle/ brake/ /gforces/ steering graphs on lap per lap basis, probably live, there's save to file, not sure if there is ability to compare between laps... I haven't played with it yet, and I haven't had the need of such graphs as of yet... Otherwise, dashmeter pro is damn good app, even has a live delta, not per sector as in the game.
If you want to get faster tho, I would recommend you to just clock many, many laps week after week... telemetry might help later, when you get into league, have a important race and you want to find the last 10th of a second to get into pole... For now, load a car with maximum fuel, go on empty track and just drive without crashing, no matter how slow, until your tank runs dry, and then do it again and again... You told me you have read all kinds of books about driving, but that's useless without experience.