I agree, that so many things effect your handling, including those items you mentioned. Even the temperature and humidity level play a huge roll. I have found though years of racing, that most people can not truly notice changes in their suspension. Not only have we've done it to fellow racers, but I have heard many confirming stories around the track which help support my claim, we tell a drive that we made changes to his/her car and never touch a thing. Guess what they typically come back and say? Yep, you probably guessed right. Man what ever you did was excellent and it really helped the car. Conclusion: the drive is typically the problem and not your set-up. Learn how to drive smooth and you can beat the best equipment on the track, with a very limited budget. Just my 2 cents.