I too would personally hesitate to shorten blades. It seems like you haven't had enough time to get used to your new blades, might therefore still change your mind, and like the previous poster said, it is a non-reversible operation.
An interesting footnote to long vs short tails: Most freestyle skaters lean backwards while skating forwards, and vice versa. Many but not all ice dancers do the exact reverse, perhaps to look more like ballroom dance. Also, freestyle skaters tend to push directly sideways during forward and backwards strokes, whereas the ice dance style is quite different. I think ice dancers typically push about 45 degrees diagonally back during forwards strokes. Partly a "look" thing rather than an efficiency thing, but it also helps avoid running into your partners skates. And during backwards strokes, they typically using a very different style, in which the pushing foot is turned, sometimes at right angles, across the gliding foot. Again, I think it is partly "look", and partly to avoid running into your partners blades.
Those things might affect how much of the blade you use while skating forwards and backwards, and, done right, might eliminate the need to shorten your blades.
I've met a lot of ice dancers who skate on standard freestyle blades, and some people in this forum do so. With the "right" style perhaps you don't need to shorten your blades.
Just a thought. You would be better off discussing it with a better skater than me, like a coach.