What’s your height and weight?

2 hrs a bottle can’t be a lot depending on temps and size. I have helped folks and can help if like. Shoot PM

Sounds like a lot of water.

On race day, your HR is higher and you're trying harder, and that puts more blood to your muscles than to your stomach compared to your training days. Less blood at the stomach = you can't digest food anywhere near as well.

You can test this by going zone 3 and 4 in the middle of your training rides and you'll see that digestion shuts down and you'll start burping up what you are taking in. But then you say, "Oh, but ZenTriBrett, I do go for those efforts in that training and I don't have that problem as much as I do in races." To which I will remind you that your training rides are also riddled with easy efforts and even stopping, which allows your fueling to catch back up. Your races do not have these pauses.

Either eat less, or go slower, or coast the downhills without pedaling. Or a combo of all these. I personally prefer coasting more on the downhills.

BTW, caffeine raises HR and retards digestion, so taking more on race day will also give you worse digestion results than in training.

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I'm 5'8'' and 135-138 on race day.

Thanks for the tips so far.