Well, you could get a GMail account. It can be set to go and get mail from other accounts, which would keep you from missing any emails, and you could slowly migrate all you contacts, sites, and other stuff to the new GMail account until very little ever comes in (that you want) from the Comcast account.
Since GMail is ISP independent, you'd never have to worry about changing providers and losing your email account, which is another bonus.
Given the limitations of a POP account, that's the route I would go.
Or you could do the same thing with iCloud by setting up forwarding for you Comcast account, if that's possible. i'm not familiar with Comcast.
Whether you end up using IMAP or Exchange Active sync (Google's other choice) managing all you email on the server, instead of worrying about what device or computer it is on, is much more efficient and headache free(r).
One other possibility, though I'd call it short term fix. I don't have any POP accounts, so I don't know if the option is there, but some account types can limit their downloads by the email'ss time stamp. Go into your Account settings on the iPad and look for an option called Mail Days to Sync. If it is there it can be set as low as 1 day. I don't think it will be there, but it might.
And that's all I can think of.