Actually A v1 = minato's base speed. Believe me i wouldnt say this if i wasnt sure.A's raiton v1 is wasy faster than minato's base speed.
ALSO ftg v2 isnt more speed its teleporting with a rasengan......cause i dont think he could make instant teleportation even faster.
You have to remember A's raiton armor comes with more perks than just speed. It gives thge user almost unpenertrable defense and super strength.
Also ftg v2 is what allowed him to hit tobi the second time round. Its not teleportation with a rasengan xd