Power Level 10
Power Level 20
From these two plots it appears that an increase in power does not shift the cutoff point to a different difference. Instead it appears that as power increases the RSSI values will shift for each distance about the same amount, but at the higher power level the cuttoff for .25 meter is a lot sharper. This means that at power level 20 it appears that the spider could have a cutoff of roughly 6 RSSI and catch all the motes within .25 meters and ignore all motes farther out.