Response time and customer service

I design sites for people part-time, but I "webmaster" only one. And it's not going too well. :\

Seeing as I also go to school and this is only part-time, I don't always spend as much time as I would like on it when doing even the simplest things like updating a few typos or adding a paragraph here or removing one there.

This is also made worse by the fact that the webmaster-host-client setup is... weird. The host, for whatever odd reason, doesn't trust me with access to the main site, so instead set me up a separate account that I work with. Whenever I'm done with updating things, I have to e-mail the client, get approval, then e-mail the host to update the main site with my files. It gets very slow when the client starts changing his mind about things and everything I have to do is through the host.

As well, most of the content my client sends is not in very good shape with regards to spelling and grammar, so, although it isn't part of my service, I end up spending a lot of time copyediting things before putting it up.

Anyway, all this makes for slow progress, and it often takes four or five days, and in bad cases, weeks, to get otherwise basic updates done.

I'm afraid that my client will put this down to bad service on my part and go with someone else. The only thing keeping me in is that my prices can't be beat — I stopped charging for updates when it started getting so slow.

What I'm looking for is advice on how I could speed things up. Should I commit more time to work (I'm on summer holiday now), or try to persuade the host to give me access to the main account, or hire someone else to do the copy work, or go with a CMS of some kind...?

Anybody else have any similar experience? Some story to share?