actualy frob Fulcrum is having a lot more foward drive than bowtie shape, the glide must be controlled better than a regular Rex witch have the gravity center closer to leading edge.
Fulcrom need to be controlled ALL the time, any slack line will make the kite to react becouse of the simetrical shape also the wind is not create that "bely" like Rev and that is making him to pull stronger. Any thing you do with Rev you may do with Fulcrum and even more, the shape of the kite is eliminate completly " the walk of shame" and on acrobatics you may perform the turtle withaut to crash ore lose control witch for Rev you need the right wind conditions and many many houres of training just for that.
Is mi opinion