- See a bike fitter.
Seriously, you are messing with LOTS of dimensions and locations with what sounds like minimal guidance.
You don’t mention if you are also planning to use this bike outside, or just for indoors. I point this out because the changes you mention, bike frame and your physical size set off alarm bells for what might be a “typical” bike setup. In particular, an 80mm stem on a 56cm size bike for your height is not typical, especially when looking at an already “endurance” focused with with a shorter Reach and Top Tube Length, coupled with taller Stack.
Much of fitting relies on two things:
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The current state of the rider, their fitness, flexibility, injury history and anything else that affects their ability to hold a range of positions on the bike.
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Your goals and/or preferences as a rider. Do you want to focus on aerodynamics, power, comfort, handling or some specific combination of those?
A fitter will look at those two areas and attempt to setup the bike to meet your needs. I started a bike fit thread for looking at these types of issues, but it is an admittedly limited resource considering the remote nature and potential for missing key details.