[myrroddin]

Assuming you set up your saved variable correctly in OnInitialize, in your enable table, change your get and set functions:

get = function()
    return self.db.profile.enable
end,
set = function(info, value)
    self.db.profile.enable = value
end

And delete lines 20-22 because that isn't going to work.

Now to disable size based on enable:

get = function()
    return self.db.profile.size
end,
set = function(info, value)
    self.db.profile.size = value
end,
disabled = function()
    return not self.db.profile.enable
end