The fusion tape brings the best of two worlds: the very high stiffness of carbon and the light weight and damping of flax. Also both fibers have a very good compatibility, since they have similar thermal expansion coefficient and failure strain.
Price per meter.
Instructions: The flax fiber absorbs more resin.
Pneumatic presses with ~5 bar is recommended to make good laminate with minimum excess resin.
Vacuum press: follow this resin quantity recommendations: resin / (resin + fabric) = 60%
Spread the resin well with a roll on a flat surface or pour the epoxy on to the fabric and then make a roll out of it. Then let it soak for some minutes. Much easier than try to smear it out.
For simulation I suggest you try to use averaged value of density and Y-modulus.