I was very surprised that the conventional formula upon which the V-Cap calculator is based on resulted in such a great reduction in the outlet cap's value. This small a cap means I can afford to use CUTF caps which must be the intent of the calculator. Hopefully someone who has replaced a much larger cap with a much smaller one can share their experience.The experience of others won't be relevant unless the load impedance they were driving approaches the 1 Megohm input impedance of your active crossover, which is an exceptionally high value. As you probably realize, that figure is why the calculator indicates 0.08 uf as being acceptable. A more typical load impedance of 50K, which is 20 times less, would raise the 0.08 uf by a factor of 20, to about 1.6 uf for the same 2 Hz corner frequency.
Good luck with your project! Regards,
-- Al