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Sorry I missed that part! I think 28mm will be a little on the tight side.
You can probably get a better idea by pushing the rims on the side and see how close it is to the chainstay, personally on a carbon bicycle, I'd er on the side of caution.
Beside the Corsa G+ is a very comfortable tyres even in 25mm.
Unless he is pushing over 100kg, that is way too high a pressure.
Ideally, 80psi rear, 60psi front give or take a person's preference and weight.
Your clearance look OK, as long the wheel is well build, and the tyres pressure is idea for your weight.