2x9 FD setup question

Hi boys and girls. I just replaced the triple crank on my son's bike with a double. We're still using the same FD and shifter. The front derailleur swings a little too far outboard even though I have the outer limit screw screwed in all the way. I think a longer limit screw might solve the problem but I wanted to check with the collective MTBR brain first. Suggestions?

Thanks in advance.