You were certainly using all of Sears corner!
And boy were you lighting it up on the exit of the Esses.
Seriously though, whilst the Quaife would be good, I reckon you also need a bigger front anti-roll bar. Because it was only on the chicanes, where you are rolling rapidly from one side to the other, and it was picking up the inside front and spinning.
Great vid though. How often do you get to Snett? Send me a PM, and I'll meet you there next time.

Its going in Monday for the Diff fitting, should be interesting to see if the lap times are any better (always blame the tools!). I've got H&R anti-roll bars front and back, not sure if you can get bigger can you? Been to Snett about 6 times got a lap down to 1.29, need help now from someone with a a bit of experience, PM you for a meet and some tips when I get the car back. 
If you have the largest ARB on the front, then maybe some stiffer front dampers - particularly stiffer on the compression side - as it is the rapid change from left to right which seems to be the biggest issue. When you are hard on the gas out of Coram, the Bomb Hole or Sears, both fronts can get the power down OK.
Have you ever been to Mallory Park or Donington? If so, what is it like coming out of the proper hairpins? And during braking in a straight line, does the front end dip much?