I took a look at the POH for this plane...now I remember why I hate cessnas so much
a piper will give you information for different weights
so, like I said, go up, find out what the stall speed is for your exact weight(safely)in KIAS, then convert it to KCAS, multiply that by 1.3, convert that number back to KIAS and come in at that speed.
but you see your poh doesn't conceive flying below max gross speed for landing
or, go out and rent a piper, and use their poh (last one I looked at would give you lower weight numbers) and see how things should work
I think cessna decided max weight was good enough and safe enough...but I don't think it was precise enough. but it makes the lawyers happy doesn't it.
and funny how we use INDICATED airspeed for flying and indeed the bottom of the white arc is indicated speeds.
good luck, fly safe and add five knots for unknown wind, non standard annemometer height or the wife kids or tax collector