I agree it should be around 15ly jump give's it more of a chance to used more for trade or combat..
That was the running argument with the FdL. It got buffs to a lot of stuff (many were things people weren't even asking for), but FSD range was not on that list. Instead we got a "working as intended."
I wish you luck, but the answer will likely be upgrading your FSD at an engineer in 2.1 (which is probably why they said no with the FdL.)