It’s difficult to say too much about the comparison between the Cham and the Soul as they can both be setup within quite a range of fork travel etc. I’ve run a Chameleon with 160mm forks and with 100mm forks – both were good but very different! Cy says you can run the Soul with anything between 100mm and 140mm, but it’s going to handle differently through that range.
But all bikes ride differently and it can take a while to learn their little quirks. What feels “wrong” at the start can become the thing you love about them in the end. I’ve found that adapting to the different front-rear balance of different bikes is the critical thing, and it’s best experimented with in cornering rather than going down (in the first instance anyway). Shifting back and forth in corners give you a more senstive feel as to where your “balanced” centre mark is.
In terms of setup, the tendence to “ride the fork” on hard tails means I’d be looking at that to start with. As cbmotorsport says, if the damping is too light it’s easy to plough through your travel too quickly and steepen everything up more than you want without realising it. Stiffer spring and/or more compression damping can help.