There are a couple of other old threads on this subject, Basically the My research came up with Red ramshorn snails being the best solution. Since you already have snails, and understand their benefit, Adding a few red rams should work nicely. Removing Ramshorns isn't extremely difficult because they have to be pretty decent (very visible) size before they reproduce. But I would also add that Ramshorns have easily become my favorite snail so you may decide not to remove them later.
Dave