Something that (and i skip read alot of the thread) that has not been pointed out is the the simple fact you hold onto the steering lock for far to long .
controlling and smoothing inputs is great however watch your video and notice where the marked top of your wheel is and i'll try and explain a sequence of events this is just how you should look to corner with a FWD , and i stand to be shot down by Fred , tony ash etc but here is the basics
approaching corner a corner choose your braking point , brake hard firm and straight change down and then start to come off the brakes but not completely as you turn towards the apex , you should be looking beyond the apex and at the apex this is where you go slightly wrong , you should be now looking down the track , and you should be UNWINDING THE LOCK ON THE STEERING WHILST APPLYING POWER . you don't unwind the wheel , and that is your major cause of understeer , for every bit of extra power you should be looking to get the front wheel to the point they are straight if you watch your wheel in the video i am not sure i once saw it past the apex unwound enough and it was held for way longer than it should .....
you would have the opposite problem if you were in a rear wheel drive car , you would be complaining of too much oversteer as holding the wheel causes the same issues but with the opposite result in a rwd car .
you will get there and eventually you won't have to think about it .
Harv.