I've had bushings/bars so tight that it seemed like it wasn't going to go in, or come out, at all.
When you pull up on a tight bar be sure to grip it right at the bend and brace your hand against the body of the trem, so you're pushing down a bit on the trem as you pull the bar up.
How I do this is to wrap my fingers around the bar, right at the bend, and brace my thumb against the high E saddle, or right behind the high E stud on the flat of the plate. This way I can apply even pressure so I'm not really pulling the trem with the arm.
This makes getting the arm out easier, and you're not pulling the bridge at an odd angle since you're bracing it, thus holding it in place while most of the upward force is applied where you really want it, on the arm.
If this worries you simply sand the bushings a little to ease the fit, though after pushing and pulling it out a few times it should be loose enough that this wouldn't be needed anyway.