just remember that reducing size by half reduces ALL axis by half and gives an item an 1/8th of a size of the original.

Here's a way to visualise this:
The small fidget cube was printed at 50% the size of the larger fidget cube (both with a 0.25mm nozzle).
50%_800x520.jpg


50%2_800x463.jpg


So it might be best to measure the same item at 1/160 and at 1/87 and work out the actual percentage difference. It's unlikely it would be 8 times smaller - but you never know :-)