Morgan IVs

I had a good 3.75% chance, I figured that maybe I should do one last summoning session on The Morgans and Chrom banner before officially saving my orbs for the Legendary Banner in 10 days, figuring that I could maybe snag Male Morgan as I got Horse Chrom and Female Morgan from previous summons before. Well, I got Morgan, but it was another Female one which, honestly, I'm totally okay with as I enjoy her quite alot (both in design and functionality) But as pretty much everyone else also gets, I have abit of an IV dilemma.
I have a
+Spd -HP
+Atk -Spd
Who should I feed into the other one for merging?