There really is a much simpler, more reliable way to build automated blogs. Of course it does require a little cash investment but I believe they still have a free trial so you could setup 3 blogs with no cash investment.
I'd recommend
Blog Automater. It's the most reliable adult feed reader available. I never seen a feed it can't read. But it's much more. (shit I sound like I'm making a sales pitch.)
It works with WP or you can use it's built in template system. Basically, it becomes a central database for posts and you can control where they go by feed, keyword, or other means.
I haven't seen T-Pat posting lately but if you happen to run across him, he can probably tell you all the advantages to BA as he used to run a very large automated blog network. He can also tell you how successful the venture has been.
But, I'll be honest with you automated blogs don't work. At least not for me. At no point was the time spent worth the time invested.
I wish you luck but my personal experience with these is that your time would be much more productive building freesites.