#28 & #29, less literal on the door. Like the arrow with the door, but consider morphing the arrow from a box shape.
#29 - box representation inside the shield need a little more definition, possibly just a gradient of color on a c "side". Shapes are great as long as the viewer can discern what it represents but the hexagon shape may not be easily discerned, so try adding a gradient on the front side to give it some definition without being too literal.
#57 and 58 just aren't working, beginning to look more like a skyline than boxes in the arrows. Might be better with just one box the defines the end of the arrow's tail so that the "T" reads better.
#61 - using the keyhole is one item too many. Works better as you did with #59, 62 and 63.