Bill Lumberg
Merica
This. It requires more force on the bars at low speed maeuvering than some other bikes. I had to increase front preload a bit, but that wasn't so much for low speed as just overall. As Twigg notes- it's not going to surpise you at low speed. I can easily U turn on a narrow road or turn around inside two parking spaces. I think the FJR feels so much lighter than it is at moderate and high speed that those really slow times can make it seem more pondorous than it is.
It's a heavy bike and to many, especially those raised on cruisers, it can feel top-heavy at times. This is something that would normally only manifest itself at low speeds. Once the speed rises the FJR is a very stable platform, again in contrast with many cruisers.
There are a bunch of bike which, while all different, have a few characteristics in common. ST1300, FJR1300, Honda Blackbird, Suzuki Hayabusa ... Fast, heavyweight sports-tourers all tend to be rock-solid continent crossers, yet can pose the odd problem in the parking lot. Personally my previous bike was a Yamaha Venture Royale, so the FJR felt like a lightweight
What I am taking a long time saying is that the low-speed handling is a feature, rather than a fault but can be made much worse by tired suspension, poor tires, wrong pressures, inexperience .... it's a long list.
By the way, motorcycle tires are notoriously poor in terms of quality control, so don't assume you have a good set even if they are fairly new.
It is worth noting that finding somewhere to practise and gain confidence was very good advice. The FJR can feel a bit like a lumbering wildebeest in a hotel parking lot, but it is very predictable holds few surprises.