A FC of 10 is not high enough to clear up the green--with a CYA of 55 you need to have it consistently at 20 ppm. The more it drops, the longer it's going to take to clear up. Also, you said you "didn't lose much chlorine" overnight--how many ppm are you talking about in loss?
If the white in the bottom of the pool is crystals, then it's not water mold--I think it's probably undissolved cal-hypo that's been sitting on your liner all this time, since it's really difficult to pre-dissolve it. Vacuuming to waste or to filter is the only way you're going to get it out of the pool.
Get your chlorine back up to 20 and hang in there!
Janet
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