I would say this: there's never too much of your own work out there. If you think you're doing too much, then pare down and focus your creative energies on one or two things. Maybe update less frequently on the comics you aren't as enamored with.
Being a creative person, getting your work out there, and finding time to do it all in is HARD. I'm about to have to decide between writing and exercise -- and unfortunately, exercise is probably going to win (for the first time in my life, I got tired climbing up one set of stairs -- admittedly it was 1.5 stories, but still, that should NOT happen). It takes me half an hour on average to submit a story because I have to find the market, format the story for that market, submit it, then put it on my spreadsheet and my follow-up calendar. Editing takes a long time too. In fact, just writing is time-consuming, but on the bright side, when you're on a roll, you're on a ROLL.
If you're looking for collaborators, why not turn to your fans? Ask them to write a week or two worth of scripts for you to review, using your characters -- basically, fanfic. When you find someone -- or a few someones -- that you like, discuss bringing them on to write story arcs. After all, Stan Lee doesn't write every single Spiderman or Fantastic Four comic. And Gene Roddenberry (before his death) certainly wasn't involved in every single Star Trek tie-in novel. If you do go this route, though, you CANNOT neglect the clause in your call for scripts that "portions of submitted scripts may appear in the comic, and anything submitted becomes property of Drowemos Enterprises (or whatever your company is)".
If you do end up bringing on a new writer that you want to transfer some ownership to, you're going to have to pay that person somehow, and the promise of future riches isn't always enough. But it might be. You will have to be fair, though; either pay the artist and the writer, or don't pay either one but offer them a similar deal to each other. You say comic writing is light work, and maybe it is, but if you think about it, both words and pictures are equally important. The comic "Everything Jake" was both well-written and well-drawn (by the same guy), but there were parts of it where the author only wrote the story as text. I have to admit I skipped over those. Similarly, if I'm watching a movie and there's a fight scene, if I don't care about how I got to this point then it doesn't matter how many awesome effects were included.
These are just my thoughts. You may have others.