lmao. Very nice indeed. I actually did this in an OWRL race in my mrt5 back in the old S1 days. I think it's a physics problem but it's quite funny to see again lol.
If it's only one wheel then it is definetly the line that you are taking into the corner. If that is the case then try and sacrifise the exit to the corner before to try and gain a good and straight line for entry to the corner otherwise this will happen and you will lose alot of time.
what is the ratio of braking on front to back?? is it around 65% front? and what force of braking is it?
the only thing i can think of is that you are pushing the brake pedal too hard. I brake full for a few seconds and then release brake pedal to about 50% down to avoid locking up.
Instead of calculating the lap times based on the results. It would probably be best to calculate how much off your normal lap time you should expect to achieve. e.g. if your average lap time is 1:40:50 then it would say +03:40 if you have bad tyres and high fuel etc instead of saying 1:43:50 because everyone has their own driving style and other people are "better" or "worse" than the average.