AI gaining Massive Speed on the straights

After 36 hours playing only GP mode as Sergio Perez, AI at 95 and no assists I have become very competitive and not struggling nearly as much as I did in the first 15-20 hours of game play. What I did to improve was practice a track in TT mode. I would pick Jarno Opmeer's setup and set him as my rival. I'm always at least 1.5 seconds slower but I got a lot better at driving and throttle application through a 30-45 minute TT session. Following his telemetry shows were my weakest points are. Before using Jarno's setups I would go with TRL setups which I found understeer too much for my style.  

Jarno's setups really suit my driving style and feel very stable on corner entries and exits. My corners exits made the most improvement and I was able to make use of the DRS and ERS better on straights. If you watch the AI they constantly hit the overtake button for very short periods on corners exits and mid way through straights. Applying this same technique also helps stick with them on straights. So far I have only done Bahrain and Austria but I am winning medium distance races at 95AI. Usually starting from 6 to 4th place. 

One thing that was really weird was in Austria I was having a strange thing happen in 6th gear during a race. Midway through the gear the revs would drop a bit and slowly climb back up. I was losing power briefly but only in 6th gear. I exited the race and started over with a different setup and the problem was gone.