Love the tips from Prism99 and Gerbie.
I used the diluted glue directly from the bottle to baste my sandwiches, but I found that it squirts a smaller thread of glue if I close the top a little. Maybe halfway, but that is hard to measure. Then when I put the glue on, I move the bottle very fast. That also makes a smaller line of glue.
I've had mostly very good luck with the glue. The only time it didn't work as well was when I was working with a very thin batt. It seems the scrim on the batt didn't absorb the glue like the fuzzy batts do.