I like cyclezen's analysis. Saddle position affects the pressure and weight on your arms and shoulders. A shorter bar position by itself might not help as much as you expect.
Stack and reach measurements are great for comparing two bikes to see if either or both is in range of a good fit or would need unusual bar and stem changes.

Stem changes
There's often a limit of 40mm for the stem spacers. That's 4 rings of the standard 10mm height. Changing the stem length and angle, and perhaps getting a shorter reach bar with less drop to the bar ends could help too.
But I expect that the maximum change for your frame will be only a moderate difference.

This stem calculator is useful. It compares two different setups in the same graphic display and shows the height and reach change in mm.
Stem Comparison Tool | yojimg.net

For example:
a +5 / -5 degree stem is fairly common, and it's usually flipped upward as a +5.
90mm to 110 mm stems are common.
3 spacers, 30mm, is also quite common.

Going to extremes, from a +5, 110mm stem, to a +17, 80mm stem with the max 40mm spacers:
The shorter setup is just 13mm / 0.5 inches higher and 38mm / 1.5 inches less reach.