Here is something very odd that I encountered yesterday. It's very odd if it's not mentioned till now, but I tried to search through the thread and found nothing.
The Setup.
Carrer. 100% races. 2012 database. Lotus. Second year. Expert. PC. Logitech MOMO Racing wheel. True AI 3.0. Competitive braking.
...
I can play like that, but It's very strange. And even stranger that it's not mentioned. And reading that guys are way faster than the AI in Q is eyebrow raiser to say the least.
Well to start, the Competitive Braking files are included with my mod, no need to reinstall those. But I haven't modded Spa braking points so no harm done there.
I have issues with Spa myself too. I'm dreadfully slow there, even with a quick race. I'm sure this is somewhat due to me using a gamepad which doesn't work too well with the flow-y nature of Spa (tough to make those small, sensitive steering adjustments with such high speed corners using a tiny joystick lol).
The main issue is this (when using my files):
Practice, Q1, Q2, Q3, and then race day all have different grip levels, reflecting the track getting "rubbered in" over the course of the weekend. Now during practice the AI drives more cautiously and therefore more slowly - a setting in the ai_choreographer file (don't change it though, it'll become a mess). So then going to Q1 you (the Player) are qualifying on a track with lower grip levels (because remember it hasn't been rubbered in too much yet),
as well as lowered grip levels due to the CTF files. Call it a triple negative - less grip due to Q1, less grip due to CTF files, and less grip due to prime tyres. During Q1 you're basically fighting a losing battle against the AI when using prime tyres.
Then in Q2, and more so in Q3 (as the grip levels come up due to the track being rubbered in more), and since you'll be using option tyres, you'll find you're much more competitive.
There's really nothing I can do about it unfortunately if you want to maintain the competitiveness during the race. If I increase the grip levels in the CTF files for the Player, you'll wind up being too fast during the race - which let's be honest, that's where you want the fun to be lol. So you're not alone, I experience this too - especially at Spa. I might need to adjust the CTF grip levels there. But as you said, once you got to the race on Expert difficulty, you found it competitive - so it does equal out by the time you get to the race.
What I do to make the best of this situation is I do just 1 or 2 hotlaps in Q1 with the option tyres if I find I'm too slow on the primes, and that usually shaves off 2+ seconds or so which is enough to bump me into Q2 where I start being more on par with the AI, and have more fun.
Hopefully that all made sense and addressed your concern