I'd use the circ saw
Same setup, just use a circ saw which is meant for "sawing" ...:smile3:
You may have to make a few runs, but it will be faster in the long run. Just keep bumping them together and follow the seam with the saw using the straight edge. I straight line rip a lot of boards on my table saw using a rip jig. It's fine for joining and way faster.
The answer to your question will only be as detailed and specific as the question is detailed and specific. Good questions also include a sketch or a photo that illustrates your issue. (:< D)