So what Ive decided to do is:
virtual_create_maildirsize = no
Ive then modified the existing maildirsize file to reflect 4gigs. This resolved the issue on the client side, but I believe that the maildirsize file will no longer be updated and my Quota Reports will not be accurate, though I noticed on the quota_notify report my user's quota did go from -75 to -37. I will be curious in the next couple days to see if this value increases. If so then I think Ive found a decent work around.