More Flier Emblem questions (mostly about Palla/Goad Fliers)

So I posted the other day about building a budget (well, more like semi-budget now) flier team, and I've ended up with Palla, Cordelia, Minerva, and Cherche (brave axe style), plus bonus backup Beruka. Seeing as how Hinoka and Caeda are permanently absent from my box and I only have the one Minerva, my buff choices are goad, goad, and goad. Here is my dilemma:

I only have 3 Pallas at the moment. My neutral 4* level 40 is the one I've been using, and I hope to 4*+10 her someday, whenever I stop foddering all my extra Pallas (and preferably once I pull one that's +spd), but unfortunately today is not that day. The other two are 3* unlevelled, but I just realized they're +atk -hp and +atk -res respectively. So the way I see it, I have two choices:

1. Promote one of the 3* Pallas (presumably +atk -hp?) to 4* and merge the neutral one into her, and use the remaining Palla to give Cherche Goad Fliers (since I figure Cordelia's more likely to need its effects than Cherche is).

2. Decide that while +atk is better than neutral, it isn't better *enough*, and use the extra Pallas to give Goad Fliers to both Cordelia and Cherche.

I admit I'm leaning toward option 2, since I'm not particularly looking forward to levelling up another Palla, only to have to do it *again* when I finally pull one that's +spd, but I guess the question is, how much better is +atk in the meantime? (I'm running her with the Ruby Sword, might potentially switch it to Wo Dao+ since I have a -spd Karel lying around, but I really like the Ruby Sword so I'm not sure.)