I don't really get why you'd want to swap Zap/Fast on Wizard/J-Beast. That would be weird. (Thematically wizards aren't known for being speedy, and why would a Beastmaster have a built-in ethereal ranged spell?)
I get that taking Quicksummoning away from S-beast might seem like a nerf, but look at it another way. After the swap, you have one Beastmaster designed for summoning swarms of level 1 creatures while keeping her distance (Ranged +1, Quicksummoning, Wounded Prey; goes great with Lair and Hunting Bow/Spear and Marked for Death, maybe Wychwood Fairy, maybe Animal Kinship since she won't have the actions/mana for a lot of equipment), and one Beastmaster designed for buddy melee that the enemy can't easily run from (Melee +1, Fast, Pet; heavier on Enchantments and select equipment; maybe Fellella) .