I took a look at your replay and setup and compared the lap to my current PB (1:28.746 in the Ferrari). Here are my thoughts, but you really want Bernd's take, as he is far better at this sort of analysis and a much better driver than I. Also, I'm not a great driver of the 67 cars, as I hate their low speed grip deficit. I'm better in the 65 cars (finally achieved negative 65 rank recently after a long, long chase).
Braking: Your braking points are very close to mine and I'd say about right. Relative to a really quick driver, e.g. Greg Stewart the world record holder, we both brake a little early, but people like Greg use special techniques to get away with terminally late braking.
Corner exit speed: You are late to get back on the throttle at Chapel, Club and Abbey. You are losing big chunks of time (half a second) on the straights that follow Chapel and Club. After Abbey you also lose time, but only about 0.2. All three of these corners are hard to master. For Chapel in particular, you need to carry higher speed while still hitting the apex.
Other things I noticed:
- Your fifth gear seems to be too high (revs drop too far when changing up into fifth). You'll lose a little top end acceleration because of that.
- You are over-revving on many upchanges (rev spikes clearly visible in Relap Analyzer). This probably explains why you are getting too many engine blow-ups. Throttle release timing is tricky for up-changes, but will come with more practice. You get it right sometimes, but not often enough yet. The 67 engines are particularly unforgiving in this respect; in the 65s you'll get away with it more. I'm not aware of any utility or other technique to warn of impending engine failure. Also, be aware there is a random element to mechanical failure in GPL (with some cars more trouble-prone than others), but mechanical abuse will definitely increase the chances.
Starting technique: Yes, it is not easy to maintain control in the 67s (much easier in 65s). But, assuming you are not using too many revs, some rapid steering corrections will be needed to maintain control. There's a thread on starting technique that's worth reading:
AI: Some of the AI drivers, e.g. Surtees, are more aggressive than the others and more prone to arse-ramming. There's quite a lot of tweaking that can be done with the AI, but it's quite an involved subject. I can give you a useful link for that if you're interested. Personally, I feel you are better off going into real races, once you are basically happy with your driving and (even more importantly) have learned the track you wish to race on. I did quite a few pick-up races before I ran my first ADC race. To begin with I used to deliberately start from the back of the pack until I became more comfortable with racing. I was petrified in my first races (could barely hold the throttle steady), but soon overcame that.
BTW: I saw your server on-line in iGOR last night and tried to connect several times. Kept getting the 10054 network device error though. You might want to go search the RSC GPL forums on that error number. Plenty of weird and wonderful theories on possible causes, but few solutions, unfortunately.
See you on track sometime.
P.S. Congrats on beating the Silverstone benchmark!