Skydragon - if you are new to sprinting, and the course, then firstly I wouldn't be too hard on yourself. I've never been to Harewood but it doesn't look very forgiving, compared to a circuit such as Brands (a very good place to start going fast) or even Lydden (plenty of hard things to hit).
When I look at your third video you look to be coming off the throttle too early, braking too gently, then trying to carry as much speed as possible into the corner, whilst missing your lines (the pair of these giving your understeer) and giving yourself lots of work to do on the exit, hence the oversteer.
That probably sounds quite critical, BUT - you're learning! This means there is plenty of room for improvement and the advice above all sounds sensible to me. Just bear in mind these are very experienced, committed guys on track so you need to build up to it.
With sprinting, as someone said above, the lines are crucial - IMHO you will gain more time and understanding if you concentrate on learning the lines carfeully and improve by building up to braking later while keeping to the same lines until you know you can't really get away with braking any earlier - then start working on how much speed you can carry through the corner. Keep the exits smooth and try and get on the throttle as early as possible on the exit without breaking traction. After that you will improve by feel.
Two things that may help:
- If there's a Circuit Guide available, read it lots and lots. They are normally excellent primers for how to approach each corner.
- If you can beg, borrow or buy a Racelogic V-Box or similar datalogger you will see very quickly on screen how early and gently you are braking, if you are on and off the throttle in corners etc. and exactly how much speed you are carrying.
Simon's video was awesome to watch - he obviously knows the lines and his car very well and has a lot of skill, as well as a quick car. The bit to take from this is the lines and learning your car - don't try to emulate the speed just yet! (your car and tyres won't let you)
Good luck - and enjoy it!
Bob Stark
Supersprinter