I find a slice of cooked carrot works best for me in getting rid of the excess Ramshorn snails.
It sinks which i prefer, Put it in the tank in the late evening, first thing in the morning use a fish net to quickly scoop it and all it's acquired occupants up .
I Have found with Ramshorns (at least mine) they tend to drop off real quickly as soon as they feel you coming,
So a quick scoop of the net works best.
Over feeding causes an over abundance of snails.