So long as your neck can handle it, and not torque out due to the difference in the higher tension of the G string compared to the lower tension of the E string, go for whatever suits you.
Most flats are of similar construction, so they will have similar tension for the gauge. Think about it: if they are too much different, then some would have cores that would be so stiff they wouldn't wrap around the tuner posts or have enough flexibility to have any overtone signature; and if the core was too small, the string wouldn't be stable.
One caveat: 75 might be just a tad much for a D string, although not unheard of.
Second caveat: I tried too heavy a set of flats once and my truss rod couldn't take it. I ended up shearing the adjustment nut on the rod and had to have it replaced.