First of all, my opinions are... opinions and relate to 1991. Also, I am neither a good, nor a knowledgeable driver, but, nonetheless, I have a fairly decent ability to take a "snap shot", so basically I can't say much beyond what I mentioned above: it's a general impression and I cannot issue any opinion on more detailed stuff such as if setup changes produce believable results, and that impression is formed based on logic, historical "knowledge" as a spectator with a clinical eye (having watched all the GPs of that era as well as some of the qualifying and practice).
So, my personal belief is that these cars were more unforgiving under throttle. You can check on boards and, coming out of turns, maximum throttle is only reached after a very careful and progressive squeeze of the pedal. In some cases, I believe, taking a more than a second.
This is specially true coming out of slow corners, where the aero should not be producing downforce due to the lack of speed.
PS: not exactly related to physics, but if you could internally push for a bit less movement on the head physics, I would appreciate it :-D