Just ease back on the feeding remove uneaten food after a couple of mins and they will level out to the amount of available food.
The thing about snails that I have observed is that they don't really seem to contribute a whole lot to bio-load so if there is a bunch of them it's not as bad as it would seem. But I wouldn't use any type of snail pesticide as it will cause them to die all at once and throw your tank out of wack.
As far as eggs you can find just remove them, they will normally be found on the underside of leaves and decorations. Or you can just leave them and do as above and they will just like the rest of the snails level out.
The thing about snails that I have observed is that they don't really seem to contribute a whole lot to bio-load so if there is a bunch of them it's not as bad as it would seem. But I wouldn't use any type of snail pesticide as it will cause them to die all at once and throw your tank out of wack.
As far as eggs you can find just remove them, they will normally be found on the underside of leaves and decorations. Or you can just leave them and do as above and they will just like the rest of the snails level out.