I'm not exactly sure I understand what you're doing, but couldn't you just start knitting onto the second circ (off of the first one) for as many stitches as you need on the second needle?
There is no right way to knit; there is no wrong way to knit. So if anybody kindly tells you that what you are doing is "wrong," don't take umbrage; they mean well. Smile submissively, and listen, keeping your disagreement on an entirely mental level. They may be right, in this particular case, and even if not, they may drop off pieces of information which will come in very handy if you file them away carefully in your brain for future reference. ~Elizabeth Zimmerman
I'm not exactly sure I understand what I'm doing either!! I've only worked with two circular needles from the very start at casting on half and half. BUT, I think with your suggestion to start knitting onto the second circular, I've been successful. It just was a different feel from starting off with two circulars. Thank you.