The seat tube angle will also get steeper with a shorter fork, which may mean you'll need a seatpost with more setback to compensate.
One option is to draw your bike in a program like Rattle CAD, Bike CAD, or even Sketchup. You don't need to get fancy. A simple line drawing would work. After drawing the bike as is, swap out for the shorter fork and measure the difference. Only you'll know if that difference is good or bad.