Overall a decent, clean lap.
A few things - don't apex T1 so early. Enter the corner a meter or so from the inside curbing and work the car in to a late apex. You are drifting out too early (because you come down to the inside of the corner a little prematurely) which doesn't allow you to get on the gas as solidly coming out of the corner, and it actually adds distance. You really need a late apex/track out where you don't make it to the curbing on the left until almost the end (just a couple car lengths before the green spot). I can't read your screen, but a sector 1 time of 15.5 or below means you did it well.
You don't need 4th gear going into the 1st hairpin. Don't let the car drift out as much mid corner - it actually makes it harder to rotate, it's typically slower speeds when you do make it rotate, and it adds unnecessary distance to the corner. Use trail braking to rotate the car around the inside. Don't hit the curb, but stay closer to the curbing most of the way around. Go 0 throttle mid-corner to continue to let the car rotate, and then get in the gas to keep the car rotating and use most all of the track out space. I don't think you get the car to rotate quite enough so you can't get hard on the gas as early as you would like. The key here is to make sure the car rotates sufficiently enough to get a late (2nd) apex or else you will add distance at track out and fight to get on the power.
T5 (or whatever that turn is under the Dunlop arch) - don't be afraid to go 0 throttle a little longer. If you wait just a little longer at 0 throttle you can get more squarely back on the gas, but in your video it looks like you are fighting too much. Also, this should help point the car to the right a little more. You don't want to use 100% of the track out because then you fight the car trying to stay full throttle through the sweeping left. If you can keep the car about 1 meter from the track-out curb you won't need to lift at all through the left, and there shouldn't even be too much tire noise. It looks like you have to lift a little there, so that's probably a tenth by itself.
2nd hairpin - it's hard to tell, but I think you brake just a little too late. This is another corner that requires patience at 0 throttle, which it looks like you do correctly. However, you really want to get all the way down to the white line as the car turns. If you back this turn up about another 2-3 meters you should be able to come out faster - which is important since it's the longest straight on the track.
Last turn - again, just a little more patience at 0 throttle and the car will turn a little better for you. At first, for me anyway, it felt like I was always fighting - and a lot of the early fast times involved a bit of drifting. However, I found that very easy on the brake at first (ease off the brake very quickly to keep the car from squealing too much), along with a good period of 0 throttle allows me to get back on the gas, get down to the apex, and come out of the corner at a good speed (I cross the finish line at around 152km/hr, which is about 94mph).
I think you are overdriving just a little bit - slower/more patience may actually end up being faster. My ghost (1:05.143) would be an OK one to download because I'm not too crazy/don't slide around a lot, but the best ghost to look at is gtp_timeattack (looks like he has a 1:04.994). He is liquid smooth, infinitely patient (his previous fast lap was #88 of the session), doesn't overcook any of the turns, and takes a very good line.
I will say it is definitely a very difficult and equally important corner to nail though with proper technique and timing.
this is by far my favorite track of the three. Now cape ring on the other hand makes me want to throw my wheel out of the window.
