I highly doubt that FT will ever be ported to Mac. I wonder whether using it under Crossover impact on this problem or not. I may finally buy version 3 if it can give me higher resolution exports, but if in the end is going to be roughly the same it does not justify the expense for me.
I've tried to compose different export, but besides the inconvenience the problem is that FT is not perfectly coherent in how it renders something, which leads to some small glitches, especially in the bump map (which is the only one for which resolution matters, anyway). Practically invisible, sure, but if I hadn't a little of OCD I would not be here, right?