
Ok first I'd like to say that if you are only able to get 3:05's that is mainly going to be down to your driving skills, No offence, please dont feel offended.
2nd, Have a look at the 1st thread in the Tuning Forum (Every GTPlanet Tune That Exists is in this thread) There will be a few setups there that you will be able to take the Suspenion, LSD and Transmission settings from. This should help you shave a few seconds off your laptime.
Mostly its going to be down to your driving though, keep practicing and you will get it.
Remember slow-in fast-out and you should get gold with ease.
Hope this helped you a bit 👍