Nice work. I'll share you a tip I've been working on too, just going by your photos. I hope you don't mind my unsolicited advice. Just rooting for your progress.
You won't believe how much getting your body positioning right helps everything. One thing that will knock you up a few notches on the confidence chart is getting your head more forward, and your chest down lower. When you're able to curl up in that cockpit a little more with your forearms horizontal, you'll notice, all of the sudden you're riding it like it was designed to be ridden and it's all easier. Up right is brutal on your neck and core. The wind is insanity, the stopping and hard acceleration is going to force your to rely on muscle strength. Get down out of the wind, stick you face out in front and look where you want to go, and bam, you do laps that aren't so exhausting.
Good trick: get on your bike on its track stands in your garage and try it. Your riding gear plays a huge roll in allowing ideal riding positions or not. Try it with shorts and a Tshirt, then try it in full gear, helmet too, so you know what's limiting your movements if anything. Make a list, what's working and what's not? What's conflicting, what's too tight, what's not allowing you to see well in that position?
If your helmet has a smaller field of view, or it's field of view is more upright, it'll be really hard to see with your head down in a tuck. See example image.
The AGV Pista GP RR, for example, has a huge field of view and is made to have your nose pointed at the ground and still be able see horizontally. My previous helmet I could never see in a good riding position. Dumb stuff like that can keep you stuck for no reason.
Another thing that no one talks about much are gloves. Can you move your hands everywhere they need to go or are your suit and your gloves conflicting? To be able to lean off to the side, you have to move your hands and grip the bars at a different angle so you can stick your elbow out. If your gloves are too tight on your sleeves you can't, so you can't lean off your bike much.
These are stupid little things that make a huge difference in riding ability.
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