Haven't done a whole lot with guns, but the Desert Eagle might be a two-hander. (though a strength-based perk to duel-wield them would be kinda neat.How do I wield a second gun? I have two Desert Eagles but the game won't let me equip the second, it just replaces the current one. I do have the perk to dual wield firearms.
e: Also, how do I progress the alraune transformation beyond racial score of 6? I tried making a new char and spamming the fruits like crazy using debug mode, but it won't go higher.
As for the plant tf, have you tried visiting Marae again?