I've been trying to crank out music for library placements more quickly, and become more efficient in both the writing aspect, and production. The goal is 15/month. Lately, my approach has been to try do similarly-produced cues in threes. In other words, when I have a decent idea - let's say it's an instrumental sports/electronica track - I write two other cues using the same instrumentation, but obviously with different chord structure and melody. That way, I'm not creating a whole new project in my DAW (Sonar in my case) with a completely new set of soft synths, drums, live mic configuration, etc. I just wipe out all the audio, and start anew from track 1, using all the same channel settings. This approach comes in handy I've found, when a cue gets signed to a library or I get strong interest in it. I then know "OK, I'm onto something with this one. Let's pump out 2-3 more that are similar."
In the back of my mind, though, I'm aware of the fact that I may be plaigairizing myself (and the publisher that eventually signs it), since all of the cues in that group invariably end up sounding somewhat alike. Is this unethical? Or is that just me offending my Inner Artist?

Can any of you that produce LOTS of library tracks share your experiences or tricks to pumping out cues at a high volume like I'm attempting to do? SURELY, every one of these isn't a completely discrete, heavenly-inspired work of art?!
Thanks!
Eliot.