Some of Jak's moves do need AP buffs, like the Peacemaker. You can't do anything from it. His Square attacks need to combo more easily. His forward square should do a bit more AP, like 10 or so, and be cancelable into other attacks. His forward triangle could honestly take a small hit, to reduce spamming. His forward circle could use a touch more range. His up circle needs to be either faster or longer, because it's almost entirely useless.
Other than those key complaints, he's fine as is.
Fresh to death