I'd like to add a few comments too, maybe even suggestions.
Personally I never had problems with clean driving. It was just the style that one can expect on a popular public server. Expect shortcomings of average drivers (such as me) and you'll evade (usually) major collisions. Expect everyone to drive like a veteran and you'll end up being crashed.
From my perspective (and I have some experience in this regard) server popularity is defined by what average and below average drivers like. They are the clear majority in LFS and where they go the rest follows. I've seen so many failures when disregarding this principle in an attempt to create "pro" servers, both Demo and S2.
In my view, the introduction of the lowest required LFS Experience Index of 200 to allow any kind racing at IHR had a substantial negative impact, probably much larger that one would expect. This attempt to improve racing quality excluded everyone new to LFS and quite large user base was lost. It is up to admins to decide if it was a good move.
Most people were coming to race. The lots of car categories are not a big problem while they are unavailable to most people. New people use STD cars (well, unless you cut them out with LFSEI), many other join them because you can have very nice racing in this category, great fun.
Some people go for TBOs, well, usually causing troubles with these heavy cars. Still, great racing is possible in this category, when everyone knows how soon he needs to brake and how to drive not to kill the tyres in one or two laps.
GTL cars are also great to have, not too much faster than STD cars. If there happened to be a few people able to use these cars, cool racing was again possible.
But in my view adding other categories on one server is counter-productive. People would be (were) using various cars, leaving the major categories empty (STD and TBO), especially when faster cars were available based on LFSEI. Newcomer must have LFSEI of 200 and even then he's almost alone in STD and that is no fun. Another large part of user base is lost, the remaining people are scattered, just hotlapping.
Well, these are just my views and I realize they can be completely wrong. Still, I'd suggest doing major changes: 1) Lower the minimum required LFSEI to say 50 to exclude only complete LFS beginners that never even raced in demo. 2) Limit car categories to say 3 (STD, TBO, GTL) on one server to compact the race field. 3) Use higher LFSEI allowing to jump directly into TBO/GTL, say 500/700.
Well, good luck!