45 PSI bladder pressure would be enough for 104 feet . You need about 12 feet for insurance up there that you're filling the pipe so that gives you 92 feet. Which would give you what, about 12 ft per floor is that enough pressure in the tank? Now if that's the case then the pressures you're seeing , are definitely pump discharge pressures and it seems that the only reason that would've gone up is a leaking fill valve.
That's assuming the tank pressure was always at 45 PSI.

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