In turn 1, you're "crabbing" the entry. You're slowly veering towards the apex before the turn-in point. Keep it to the far left and then turn in when you want to, don't use the whole braking zone to turn in.
In a few corners you're using too much steering angle. This is a pretty common reaction when new drivers encounter undesteer - add more wheel and it should go away right? Not really. The tires have a specific angle relative to the direction of travel that they work best at. Going beyond this angle will reduce the grip, and thus, the turning ability of the front tires. Long story short, try to move the steering wheel as little as possible as you turn. The more you turn the wheel the more the front tires act as a brake, and in extreme understeer situations if you turn the wheel too far, like you're doing, you'll just make it understeer more and scrub off more speed. If you find yourself understeering uncontrollably, don't turn the wheel more, just lift the gas and/or rub the brake very gently.
The other thing is your brake release. Most of the time you release the brake too early and too sharply. A couple of times you released the brake too late and also too sharply.
The basic idea behind your break release is to be digressive (meaning, hard initially during the slowing down phase, then gradually lighter and lighter as you turn more and more).
You've seen a circular G graph before, right, like on Formula 1 telemetry? Especially with a slow speed road car like we've got here, you want those G forces movements to be as smooth as possible. If during the braking zone we have the G forces "pip" pointing to the very top of the graph at the 12 o clock position, then, as we turn in to the corner, we want that pip to move smoothly about the edge of the graph until it reaches the 9 or 5 position for either full right or left turning. Like this: (the trailing section towards the bottom is the acceleration phase out of the corner)
Sometimes Skip Barber here in the US will put their drivers through a practical exercise in a sedan with a bowl on the hood with a tennis ball in it. The idea is to go as fast as you can around a track without making the ball fall out of the bowl. You can go at full race speed and it won't fall out if you're smooth. That's the idea behind smooth brake release.
If you release the brake unsmoothly and too early, like you do most of the time, the G forces won't have that smooth transition, the front will come up, and you'll understeer from lack of front end bite.
If you release the brake unsmoothly and too late, the fronts will lock and you won't be able to turn.
If you fix those 3 things you'll be in the 1:34s no problem.