11 or 12 races yesterday with a new game started with 1.31c (mid race length, GT2, some minor mods added). No major bugs encountered.
Some more detailed things:
A. Once again saw an interview asking if I wanted to hire my own driver. I thought I took a screenshot of it, but apparently I did not, since I can't find it anywhere.
B. 3 random breakdowns, 2 of them in the same race. Seems ok to me.
C. I'm also (still) happy with the number of spins. And I've got kinda rubbish pilots.
D. 2 punctures, one at 20% wear and another at ~5%. The 20% one completely ruined my race, season and career, which is excellent!
E. I also have the display bug with estimated tyre duration. I did not pay much attention to it yet, but it seems to be recurring.
Game balance suggestions:
1. Longer time required to make the new car parts would be nice (+bigger influence of design office to it, leading to roughly same speed only at higher levels, longer at lower). If you have a few spec parts, you'll run out of things to do atm, even with a crap team. This would also make the bonus from Ex-Engineer background more important.
2. Mechanics skills could also use some balancing. Is pitstop legend any good at any level?
3. I'm not 100% convinced of the idea of removing the possibility of choosing the lower finish for new season than your previous one was. Sometimes it just makes sense to do a controlled step back in order to have two steps forward (e.g. when doing major upgrades to HQ or replacing drivers with young talent), and IMO the option should be left in the game. Think about McLaren with their Honda deal, I'm sure they knew they'll lose ground (even if they hoped it wouldn't be as bad as it is).
4. Does the mechanical issues / spanner icon actually have any effect on car speed? Should it? Should it be bigger?
Smaller workshop-kind of stuff (that I might mod in for my own use anyways):
5. Some tweaking for standard part components. There's some idiotic ones that just fill the grid and are never used. Especially the ones which raise the red zone.
6. Engineer part components - I think all the skills that only apply to races or qualify should be removed and replaced with something else. Does anyone really use the +to race or +to qualify components, if better ones are available? Especially the qualify thing is bad, since you don't even have a quali in half of the serieses. I think Engineer components should always be something useful and worth considering, and that'd make a bigger portion of the available pool worth hiring.
Overhauling the sponsors once again maybe an interesting thing for me to do one day (after the interviews, dilemmas and messages), but lots of mods are modding sponsors already - so me doing it may be a waste of my time.
Like you said, there's plenty of sponsor mods already, and they are relatively trivial to make (or steal from workshop mods for your own use, as I have done with ICE), so I really wouldn't bother. Please concentrate on more important stuff, things that go beyond workshop mods!
I'll take a look at the interview stuff, and if I understand something, maybe I get some inspirations from the triggers.