yep, give it some more time. as long as the air around the clutch stays fairly humid it should hatch. all my recent clutches i actually allowed to get rather dry (open top tank) and they seemed to hatch faster than those i had kept humid in the past. no idea why though.
you mentioned that you have 5 clutches now. if this is your first go at raising baby snails i would freeze and throw away all but one of your clutches, since each clutch yields many babies! we're talking possibly over 100 per clutch, and you really don't want to have to deal with that many baby snails.
as for Darryl's comment on the clutch turning blue when it's about ready to hatch, i've noticed that the darker colour appears when the clutch is filled with mostly dark snails, such as blue or jade. ivory and goldens do not produce the blue colour on the clutch before hatching, from my experience. most likely due to the pigmentation in the baby snail's shells showing through the ever thinning egg case, IMO.